• 21 Aug, 2019

• By, Wikipedia

Operation Allied Force

NATO victory

• Kumanovo Agreement
• Establishment and deployment of KFOR
• Withdrawal of Yugoslav forces from Kosovo and Metohija
• Establishment of UNMIK
• Substantial damage to Yugoslav economy and infrastructure
• Return of Albanian refugees to Kosovo
• Departure of many Serb and other non-Albanian civilians

Territorial
changes UN Resolution 1244; de facto separation of Kosovo from Yugoslavia under UN temporary administrationBelligerents

 NATO

•  Belgium
•  Canada
•  Denmark
•  France
•  Germany
•  Italy
•  Netherlands
•  Norway
•  Portugal
•  Spain
•  Turkey
•  United Kingdom
•  United States

 FR YugoslaviaCommanders and leaders

• Wesley Clark
  (SACEUR)
• Rupert Smith
  (DSACEUR)
• Michael C. Short
  (AIRSOUTH)
• James O. Ellis
  (AFSOUTH)
• Javier Solana
  (Secretary General of NATO)

---

John W. Hendrix

• Slobodan Milošević
• Dragoljub Ojdanić
• Nebojša Pavković
• Spasoje Smiljanić
• Milan Zec

Strength NATO:

• 1,031+ aircraft
• 30 warships & submarines
• Task Force Hawk

• 114,000 regulars
• 20,000 police
• 1,270 tanks
• 825 armoured vehicles
• 1,400 artillery pieces
• 100 SAM launchers
• 14 modern combat aircraft

Casualties and losses

• 3 jet fighters destroyed
• 3 jet fighters damaged
• 2 helicopters destroyed
• 46 UAVs destroyed
• 2 soldiers killed (out of combat)
• 3 soldiers captured

2013 Serbian MOD estimate:

• 1,008 killed (659 servicemen and 349 policemen)
• 5,173 wounded

Acc. to FHP:
304 soldiers and policemen

---

Material losses:
NATO estimate:

• 93 tanks destroyed
• 153 APCs destroyed
• 389 artillery pieces destroyed
• 339 other vehicles destroyed
• 121 aircraft destroyed

Yugoslav estimate:

• 13 tanks destroyed
• 6 APCs destroyed
• 6 artillery pieces destroyed

Newsweek estimate:

• 14 tanks destroyed
• 18 APCs destroyed
• 20 artillery pieces destroyed

Human Rights Watch estimate: 489–528 civilians killed (60% of whom were in Kosovo)
Yugoslav estimate: 1,200–2,000 civilians killed and about 6,000 civilians wounded
FHP: 218 Albanians, 204 Serbs and 30 others

3 Chinese citizens killed in NATO's bombing of China's embassy in Belgrade

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The North Atlantic Treaty Organization (NATO) carried out an aerial bombing campaign against the Federal Republic of Yugoslavia during the Kosovo War. The air strikes lasted from 24 March 1999 to 10 June 1999. The bombings continued until an agreement was reached that led to the withdrawal of the Yugoslav Army from Kosovo, and the establishment of the United Nations Interim Administration Mission in Kosovo, a UN peacekeeping mission in Kosovo. The official NATO operation code name was Operation Allied Force (Serbian: Савезничка сила / Saveznička sila) whereas the United States called it Operation Noble Anvil (Serbian: Племенити наковањ / Plemeniti nakovanj); in Yugoslavia the operation was incorrectly called Merciful Angel (Serbian: Милосрдни анђео / Milosrdni anđeo), possibly as a result of a misunderstanding or mistranslation.

NATO's intervention was prompted by Yugoslavia's bloodshed and ethnic cleansing of Albanians, which drove the Albanians into neighbouring countries and had the potential to destabilize the region. Yugoslavia's actions had already provoked condemnation by international organisations and agencies such as the UN, NATO, and various INGOs. Yugoslavia's refusal to sign the Rambouillet Accords was initially offered as justification for NATO's use of force. NATO countries attempted to gain authorisation from the UN Security Council for military action, but were opposed by China and Russia, who indicated that they would veto such a measure. As a result, NATO launched its campaign without the UN's approval, stating that it was inter alia a humanitarian intervention. The UN Charter prohibits the use of force except in the case of a decision by the Security Council under Article 42, under Article 51 or under Article 53. Three days after the commencement of hostilities, on 26 March 1999, the Security Council rejected the demand of Russia, Belarus and India for the cessation of the use of force against Yugoslavia.

By the end of the war, the Yugoslavs had killed 1,500 to 2,131 combatants. 10,317 civilians were killed or missing, with 85% of those being Kosovar Albanian and some 848,000 were expelled from Kosovo. The NATO bombing killed about 1,000 members of the Yugoslav security forces in addition to between 489 and 528 civilians. It destroyed or damaged bridges, industrial plants, hospitals, schools, cultural monuments, and private businesses, as well as barracks and military installations. In total, between 9 and 11 tonnes of depleted uranium was dropped across all of Yugoslavia. In the days after the Yugoslav army withdrew, over 164,000 Serbs and 24,000 Roma left Kosovo. Many of the remaining non-Albanian civilians (as well as Albanians perceived as collaborators) were victims of abuse which included beatings, abductions, and murders. After Kosovo and other Yugoslav Wars, Serbia became home to the highest number of refugees and internally displaced persons (including Kosovo Serbs) in Europe.

The bombing was NATO's second major combat operation, following the 1995 bombing campaign in Bosnia and Herzegovina. It was the first time that NATO had used military force without the expressed endorsement of the UN Security Council and thus, international legal approval, which triggered debates over the legitimacy of the intervention.

A NATO-facilitated ceasefire between the KLA and Yugoslav forces was signed on 15 October 1998, but both sides broke it two months later and fighting resumed. UN Security Council resolution 1160, resolution 1199 and resolution 1203 had been disregarded. When the killing of 45 Kosovar Albanians in the Račak massacre was reported in January 1999, NATO decided that the conflict could only be settled by introducing a military peacekeeping force to forcibly restrain the two sides. Yugoslavia refused to sign the Rambouillet Accords, which among other things called for 30,000 NATO peacekeeping troops in Kosovo; an unhindered right of passage for NATO troops on Yugoslav territory; immunity for NATO and its agents to Yugoslav law; and the right to use local roads, ports, railways, and airports without payment and requisition public facilities for its use free of cost. NATO then prepared to install the peacekeepers by force, using this refusal to justify the bombings.

In its Statement Issued at the Extraordinary Ministerial Meeting of the North Atlantic Council held at NATO Headquarters, Brussels, on 12th April 1999 three weeks after the start of hostilities on 23 March 1999, the collective said that "The Federal Republic of Yugoslavia (FRY) has repeatedly violated United Nations Security Council resolutions. The unrestrained assault by Yugoslav military, police and paramilitary forces, under the direction of President Milosevic, on Kosovar civilians has created a massive humanitarian catastrophe which also threatens to destabilise the surrounding region. Hundreds of thousands of people have been expelled ruthlessly from Kosovo by the FRY authorities. We condemn these appalling violations of human rights and the indiscriminate use of force by the Yugoslav government. These extreme and criminally irresponsible policies, which cannot be defended on any grounds, have made necessary and justify the military action by NATO."

NATO's objectives in the Kosovo conflict were stated at the North Atlantic Council meeting held at NATO headquarters in Brussels on 12 April 1999:

• An end to all military action and the immediate termination of violence and repressive activities by the Milošević government;
• Withdrawal of all military, police and paramilitary forces from Kosovo;
• Stationing of UN peacekeeping presence in Kosovo;
• Unconditional and safe return of all refugees and displaced persons;
• Establishment of a political framework agreement for Kosovo based on Rambouillet Accords, in conformity with international law and the Charter of the United Nations.

Operation Allied Force predominantly used a large-scale air campaign to destroy Yugoslav military infrastructure from high altitudes. After the third day of aerial bombing, NATO had destroyed almost all of its strategic military targets in Yugoslavia. Despite this, the Yugoslav army continued to function and to attack Kosovo Liberation Army (KLA) insurgents inside Kosovo, mostly in the regions of Northern and Southwest Kosovo. NATO bombed strategic economic and societal targets, such as bridges, military facilities, official government facilities, and factories, using long-range cruise missiles to hit heavily defended targets, such as strategic installations in Belgrade and Pristina. The NATO air forces also targeted infrastructure, such as power plants (using the BLU-114/B "Soft-Bomb"), water-processing plants and the state-owned broadcaster. The Dutch foreign minister Jozias van Aartsen said that the strikes on Yugoslavia should be such as to weaken their military capabilities and prevent further humanitarian atrocities.

Due to restrictive media laws, media in Yugoslavia carried little coverage of what its forces were doing in Kosovo, or of other countries' attitudes to the humanitarian crisis; so, few members of the public expected bombing, instead thinking that a diplomatic deal would be made.

While according to Noel Malcolm: "During the first few days of the air-strike campaign, while NATO confined itself to the use of cruise missiles and high-altitude bombing, the Serbian forces inside Kosovo embarked on a massive campaign of destruction, burning down houses and using tanks and artillery to reduce entire villages to rubble."

According to John Keegan, the capitulation of Yugoslavia in the Kosovo War marked a turning point in the history of warfare. It "proved that a war can be won by air power alone". Diplomacy had failed before the war, and the deployment of a large NATO ground force was still weeks away when Slobodan Milošević agreed to a peace deal.

As for why air power should have been capable of acting alone, it has been argued by military analysts that there are several factors required. These normally come together only rarely, but all occurred during the Kosovo War:

1. Bombardment needs to be capable of causing destruction while minimising casualties. This causes pressure within the population to end hostilities rather than to prolong them. The exercise of precision air power in the Kosovo War is said by analysts to have provided this.
2. The government must be susceptible to pressure from within the population. As was demonstrated by the overthrow of Milošević a year later, the Yugoslav government was only weakly authoritarian and depended upon support from within the country.
3. There must be a disparity of military capabilities such that the opponent is unable to inhibit the exercise of air superiority over its territory. Serbia, a relatively small impoverished Balkan state, faced a much more powerful NATO coalition including the United Kingdom and the United States.
4. Carl von Clausewitz once called the "essential mass of the enemy" his "centre of gravity". Should the center of gravity be destroyed, a major factor in Yugoslav will to resist would be broken or removed. In Milošević's case, the centre of gravity was his hold on power. He manipulated hyperinflation, sanctions and restrictions in supply and demand to allow powerful business interests within Serbia to profit and they responded by maintaining him in power. The damage to the economy, which squeezed it to a point where there was little profit to be made, threatened to undermine their support for Milošević if the air campaign continued, whilst causing costly infrastructure damage.

1. Diplomacy:
   1. According to British Lieutenant-General Mike Jackson, Russia's decision on 3 June 1999 to back the West and to urge Milošević to surrender was the single event that had "the greatest significance in ending the war". The Yugoslav capitulation came the same day. Russia relied on Western economic aid at the time, which made it vulnerable to pressure from NATO to withdraw support for Milošević.
   2. Milošević's indictment by the UN as a war criminal (on 24 May 1999), even if it did not influence him personally, made the likelihood of Russia resuming diplomatic support less likely.
   3. The Rambouillet Agreement of 18 March 1999, had Yugoslavia agreed to it, would have given NATO forces the right of transit, bivouac, manoeuvre, billet, and use across Serbia. By the time Milošević capitulated, NATO forces were to have access only to Kosovo proper.
   4. The international civil presence in the province was to be under UN control which allowed for a Russian veto should Serb interests be threatened.
2. Concurrent ground operations – The KLA undertook operations in Kosovo itself and had some successes against Serb forces. The Yugoslav army abandoned a border post opposite Morinë near the Yugoslav army outpost at Košare in the north west of the province. The Yugoslav army outpost at Košare had remained in Yugoslav hands throughout the war: this allowed for a supply line to be set up into the province and the subsequent taking of territory in the Junik area. The KLA also penetrated a few miles into the south-western Mount Paštrik area. But most of the province remained under Serb control.
3. Potential ground attack – General Wesley Clark, Supreme Allied Commander Europe, was "convinced" that planning and preparations for ground intervention "in particular, pushed Milošević to concede". The Yugoslav capitulation occurred on the same day that US President Bill Clinton held a widely publicised meeting with his four service chiefs to discuss options for a ground-force deployment in case the air war failed. However, France and Germany vigorously opposed a ground offensive, and had done so for some weeks, since April 1999. French estimates suggested that an invasion would need an army of 500,000 to achieve success. This left NATO, particularly the United States, with a clear view that a land operation had no support. With this in mind, the US reaffirmed its faith in the air campaign. The reluctance of NATO to use ground forces cast serious doubt on the idea that Milošević capitulated out of fear of a land invasion.

On 20 March 1999, OSCE Kosovo Verification Mission monitors withdrew from Kosovo citing a "steady deterioration in the security situation", and on 23 March 1999 Richard Holbrooke returned to Brussels and announced that peace talks had failed. Hours before the announcement, Yugoslavia announced on national television it had declared a state of emergency citing an "imminent threat of war ... against Yugoslavia by Nato" and began a huge mobilisation of troops and resources. On 23 March 1999 at 22:17 UTC the Secretary General of NATO, Javier Solana, announced he had directed the Supreme Allied Commander Europe (SACEUR), General Wesley Clark, to "initiate air operations in the Federal Republic of Yugoslavia."

The campaign involved 1,000 aircraft operating from air bases in Italy and Germany, and the aircraft carrier USS Theodore Roosevelt sailing in the Adriatic Sea. During the ten weeks of the conflict, NATO aircraft flew over 38,000 combat missions.

On 24 March at 19:00 UTC NATO started the bombing campaign against Yugoslavia. F/A-18 Hornets of the Spanish Air Force were the first NATO planes to bomb Belgrade and perform SEAD operations. BGM-109 Tomahawk cruise missiles were fired from ships and submarines in the Adriatic.

In addition to fixed-wing air power, one battalion of Apache helicopters from the US Army's 11th Aviation Regiment was deployed to help combat missions. The regiment was augmented by pilots from Fort Bragg's 82nd Airborne Attack Helicopter Battalion. The battalion secured AH-64 Apache attack helicopter refueling sites, and a small team forward deployed to the Albania – Kosovo border to identify targets for NATO air strikes.

The campaign was initially designed to destroy Yugoslav air defences and high-value military targets. NATO military operations increasingly attacked Yugoslav units on the ground, as well as continuing the strategic bombardment. Montenegro was bombed several times, and NATO refused to prop up the precarious position of its anti-Milošević leader, Milo Đukanović. "Dual-use" targets, used by civilians and military, were attacked, including bridges across the Danube, factories, power stations, telecommunications facilities, the headquarters of Yugoslav Leftists, a political party led by Milošević's wife, and the Avala TV Tower. Some protested that these actions were violations of international law and the Geneva Conventions. NATO argued these facilities were potentially useful to the Yugoslav military and thus their bombing was justified.

On 12 April, NATO airstrikes struck a railway bridge in Grdelica, hitting a civilian passenger train and killing twenty people. Showing video footage, General Wesley Clark later apologized and stated that the train had been traveling too fast and the bomb was too close to the target for it to divert in time. The German daily Frankfurter Rundschau reported in January 2000 that the NATO video had been shown at three times its real speed, giving a misleading impression of the train's speed.

On 14 April, NATO planes bombed ethnic Albanians near Koriša who had been used by Yugoslav forces as human shields. Yugoslav troops took TV crews to the scene shortly after the bombing. The Yugoslav government insisted that NATO had targeted civilians.

On 23 April, NATO bombed the Radio Television of Serbia headquarters killing sixteen civilian employees. This was labeled as a war crime by Amnesty International. NATO claimed that the bombing was justified because the station operated as a propaganda tool for the Milošević regime.

On 7 May, the US bombed the Chinese embassy in Belgrade, killing three Chinese journalists and injuring at least 20. The US defence secretary explained the cause of the error as "because the bombing instructions were based on an outdated map", but the Chinese government did not accept this explanation. The Chinese government issued a statement on the day of the bombing, stating that it was a "barbarian act". The target had been selected by the Central Intelligence Agency outside the normal NATO targeting regime. The US president Bill Clinton apologised for the bombing, saying it was an accident. The US gave China financial compensation. The bombing strained relations between the People's Republic of China and NATO, provoking angry demonstrations outside Western embassies in Beijing. The victims were Xu Xinghu, his wife Zhu Ying, and Shao Yunhuan. An October 1999 investigation by The Observer and Politiken argued that the bombing had actually been deliberate as the Embassy was being used to transmit Yugoslav army communications, something that NATO, the UK and the USA emphatically denied. In April 2000, The New York Times published its own investigation, claiming to have found "no evidence that the bombing of the embassy had been a deliberate act."

Solana directed Clark to "initiate air operations in the Federal Republic of Yugoslavia". Clark then delegated responsibility for the conduct of Operation Allied Force to the Commander-in-Chief of Allied Forces Southern Europe, who in turn delegated control to the Commander of Allied Air Forces Southern Europe, Lieutenant-General Michael C. Short, USAF. Operationally, the day-to-day responsibility for executing missions was delegated to the Commander of the 5th Allied Tactical Air Force.

The Hague Tribunal ruled that over 700,000 Kosovo Albanians were forcibly displaced by Yugoslav forces into neighbouring Albania and Macedonia, with many thousands internally displaced within Kosovo. By April, the United Nations reported 850,000 refugees had left Kosovo. Another 230,000 were listed as internally displaced persons (IDPs): driven from their homes, but still inside Kosovo. German Foreign Minister Joschka Fischer and Defense Minister Rudolf Scharping claimed at the time that the refugee crisis was produced by a coordinated Yugoslav plan of ethnic cleansing codenamed "Operation Horseshoe". The existence and character of such a plan has been called into question.

Serbian Television claimed that huge columns of refugees were fleeing Kosovo because of NATO's bombing, not Yugoslav military operations. The Yugoslav side and its Western supporters claimed the refugee outflows were caused by a mass panic in the Kosovo Albanian population, and that the exodus was generated principally by fear of NATO bombs.

The United Nations and international human rights organisations were convinced the crisis resulted from a policy of ethnic cleansing. Many accounts from both Serbs and Albanians identified Yugoslav security forces and paramilitaries as the culprits, responsible for systematically emptying towns and villages of their Albanian inhabitants by forcing them to flee.

Atrocities against civilians in Kosovo were the basis of United Nations war crimes charges against Milošević and other officials responsible for directing the Kosovo conflict.

On 29 March 1999, to escape possible destruction, Jat Airways evacuated around 30 of its fleet of civilian aircraft from Belgrade to neighbouring countries for safekeeping.

An important portion of the war involved combat between the Yugoslav Air Force and the opposing air forces from NATO. United States Air Force F-15s and F-16s flying from Italian airforce bases attacked the defending Yugoslav fighters, mainly MiG-29s, which were in poor condition due to a lack of spare parts and maintenance. Other NATO forces also contributed to the air war.

Air combat incidents:

• During the night of 24/25 March 1999: Yugoslav Air Force scrambled five MiG-29s to counter the initial attacks. Two fighters that took off from Niš Airport were vectored to intercept targets over southern Serbia and Kosovo were dealt with by NATO fighters. The MiG-29 flown by Maj. Dragan Ilić was damaged; he landed with one engine out and the aircraft was later expended as a decoy. The second MiG, flown by Maj. Iljo Arizanov, was shot down by an USAF F-15C piloted by Lt. Col. Cesar Rodriguez. A pair from Batajnica Air Base (Maj. Nebojša Nikolić and Maj. Ljubiša Kulačin) were engaged by USAF Capt. Mike Shower who shot down Nikolić while Kulačin evaded several missiles fired at him, while fighting to bring his malfunctioning systems back to working order. Eventually realising that he could not do anything, and with Batajnica AB under attack, Kulačin diverted to Belgrade Nikola Tesla Airport, hiding his aircraft under the tail of a parked airliner. The fifth and last MiG-29 to get airborne that night was flown by Maj. Predrag Milutinović. Immediately after take-off his radar failed and electrical generator malfunctioned. Shortly after, he was warned of being acquired by fire control radar, but he eluded the opponent by several evasive manoeuvres. Attempting to evade further encounters, he approached Niš Airport, intending to land, but he was eventually shot down by a KLU F-16AM flown by Maj. Peter Tankink and forced to eject.
• In the morning of 25 March, Maj. Slobodan Tešanović stalled his MiG-29 while landing on Ponikve Airbase after a re-basing flight. He ejected safely.
• During the war Yugoslav strike aircraft J-22 Oraos and G-4 Super Galebs performed some 20–30 combat missions against the KLA in Kosovo at treetop level causing some casualties. During one of those missions on 25 March 1999, Lt. Colonel Života Ðurić was killed when his J-22 Orao hit a hill in Kosovo. It was never firmly established whether an aircraft malfunction, pilot error or if enemy action (by KLA) was the cause (NATO never claimed they shot it down).
• In the afternoon of 25 March 1999 two Yugoslav MiG-29s took off from Batajnica to chase a lone NATO aircraft flying in the direction of the Bosnian border. They crossed the border and were engaged by two US F-15s. Both MiGs were shot down by Captain Jeff Hwang. One MiG pilot, Major Slobodan Perić, having evaded at least one missile before being hit ejected, was later smuggled back to Yugoslavia by the Republika Srpska police. The other pilot, Captain Zoran Radosavljević, did not eject and was killed.
• On 27 March 1999, the 3rd Battalion of the 250th Missile Brigade, under the command of Colonel Zoltán Dani, equipped with the Isayev S-125 'Neva-M' (NATO designation SA-3 Goa), downed an American F-117 Nighthawk. The pilot ejected and was rescued by search and rescue forces near Belgrade. This was the first and so far only time a stealth aircraft has been shot down by hostile ground fire in combat.
• Several times between 5 and 7 April 1999, Yugoslav MiG-29s were scrambled to intercept NATO aircraft, but turned back due to malfunctions.
• On 7 April 1999 four RQ-5A Hunter UAVs were shot down.
• On 30 April, some US sources claim that a second F-117A was damaged by a surface-to-air missile. Although the aircraft returned to base, it supposedly never flew again.
• On 2 May, a USAF F-16 was shot down near Šabac by a SA-3, again fired by the 3rd Battalion of the 250th Missile Brigade. The pilot Lt. Colonel David Goldfein, commander of the 555th Fighter Squadron, was rescued. On the same day an A-10 Thunderbolt II was damaged by a Strela 2 shoulder-mounted SAM over Kosovo and had to make an emergency landing at a Skopje airport in Macedonia, and a Marine Corps Harrier crashed while returning to the amphibious assault carrier USS Kearsarge from a training mission. Its pilot was rescued.
• On 4 May, a Yugoslav MiG-29, piloted by Lt. Col. Milenko Pavlović, commander of the 204th Fighter Aviation Wing, was shot down at a low altitude over his hometown Valjevo by two USAF F-16s. The falling aircraft was possibly hit as well by Strela 2 fired by Yugoslav troops. Pavlović was killed.
• On 11 May, an A-10 was lightly damaged over Kosovo by 9K35 Strela 10.
• During the war NATO lost two AH-64 Apache strike helicopters (one on 26 April and the other on 4 May in Albania near the border with Yugoslavia, in training accidents resulting in death of two US Army crew members.
• NATO reported that it lost 21 UAVs to technical failures or enemy action during the conflict, including at least seven German UAVs and five French UAVs. While the commander of the Yugoslav Third Army claimed that 21 NATO UAVs had been shot down by Yugoslav forces, another Yugoslav general claimed that Yugoslav air defences and ground forces had shot down 30 UAVs. One of the preferred Yugoslav tactics to destroy hostile UAVs involved the use of transport helicopters in air-to-air combat role. The first IAI RQ-5 Hunter drone lost by the US Army in the campaign was apparently shot down by a Mi-8 helicopter flying alongside, with the door gunner firing a 7.62 mm machine gun. The manoeuvre was repeated several times until Allied air supremacy made this practice too dangerous.

Suppression of Enemy Air Defences or SEAD operations for NATO were principally carried out by the US Air Force, with fifty F-16CJ Block 50 Fighting Falcons, and the US Navy and Marines, with 30 EA-6B Prowlers. The F-16CJs carried AGM-88 HARM anti-radiation missiles which would home in on and destroy any active Yugoslav radar systems, while the Prowlers provided radar jamming assistance (though they could carry HARMs as well). Additional support came in the form of Italian and German Tornado ECRs which also carried HARMs.

USAF Compass Call EC-130s were used to intercept and jam Yugoslav communications, while RC-135s conducted bomb damage assessment.

The standard tactic for F-16CJs was for two pairs to come at a suspected air defence site from opposite directions, ensuring total coverage of the target area, and relaying information to incoming strike craft so they could adjust their flight path accordingly.

Where possible, NATO attempted to proactively destroy air defence sites, using F-16CGs and F-15E Strike Eagles carrying conventional munitions including cluster bombs, AGM-130 boosted bombs, and AGM-154 Joint Standoff Weapon missiles.

Many NATO aircraft made use of new towed decoys designed to lure away any missiles fired at them. Reportedly, NATO also for the first time employed cyberwarfare to target Yugoslav air defence computer systems.

A number of deficiencies in NATO's SEAD operations were revealed during the course of the bombing campaign. The EA-6Bs were noticeably slower than other aircraft, limiting their effectiveness in providing support, and land-based Prowlers flying out of Aviano Air Base were forced to carry extra fuel tanks instead of HARMs due to the distances involved. The F-16CJ Block 50 could not carry the LANTIRN targeting pod, making it unable to conduct precision bombing at night. Moreover, the US Air Force had allowed its electronic warfare branch to atrophy in the years after the Gulf War. Training exercises were fewer and less rigorous than before, while veterans with electronic warfare experience were allowed to retire with no replacement. The results were less than satisfactory: response times to engaging a SAM threat actually increased from the Gulf War, and electronic warfare wings could no longer reprogram their own jamming pods but had to send them elsewhere for the task.

Further difficulties came in the form of airspace restrictions, which forced NATO aircraft into predictable flight paths, and rules of engagement which prevented NATO from targeting certain sites for fear of collateral damage. In particular this applied to early-warning radars located in Montenegro, which remained operational during the campaign and gave Yugoslav forces advanced warning of incoming NATO air raids. Kosovo's mountainous terrain also made it difficult for NATO to locate and target Yugoslav air defences, while at the same time the region's poor infrastructure limited where Yugoslav SAM and AAA sites could be placed.

Yugoslav air defences were much fewer than what Iraq had deployed during the Gulf War – an estimated 16 SA-3 and 25 SA-6 surface-to-air missile systems, plus numerous anti-aircraft artillery (AAA) and man-portable air defence systems (MANPADS) – but unlike the Iraqis they took steps to preserve their assets. Prior to the conflict's start Yugoslav SAMs were preemptively dispersed away from their garrisons and practiced emission control to decrease NATO's ability to locate them. The Yugoslav integrated air defence system (IADS) was extensive, including underground command sites and buried landlines, which allowed for information to be shared between systems. Active radar in one area could target NATO aircraft for SAMs and AAA in another area with no active radar, further limiting NATO's ability to target air defence weapons.

During the course of the campaign, NATO and Yugoslav forces engaged in a "cat-and-mouse" game which made suppressing the air defences difficult. Yugoslav SAM operators would turn their radars on for no longer than 20 seconds, allowing little chance for NATO anti-radiation missions to lock on to their emissions. While most Yugoslav SAMs were fired ballistically (with no radar guidance) at NATO aircraft, as many as a third were guided by radar, forcing the targeted aircraft to jettison fuel tanks and take evasive action. In response, over half of NATO's anti-radiation missiles were pre-emptively fired at suspected air defence sites so that if a radar system did become active the missiles would be able to lock on more quickly.

Where possible, Yugoslav air defences attempted to bring NATO aircraft into range of AAA and MANPADS. A common tactic was to target the last aircraft in a departing formation, on the assumption that it received less protection, was flown by a less-experienced pilot, and/or was low on fuel needed to make evasive manoeuvres. However, because AAA were limited to deploying close to roads for mobility and became bogged down in difficult terrain, NATO pilots learned to avoid these by staying at least five kilometers away from roads, never flying along them and only crossing them at a perpendicular angle, though this made spotting ground traffic more difficult.

By focusing on their operational survival, Yugoslav air defences ceded a certain amount of air superiority to NATO forces. Yet the persistence of their credible SAM threat forced NATO to allocate greater resources to continued SEAD operations rather than conducting other missions, while Yugoslav AAA and MANPADS forced NATO aircraft to fly at 15,000 ft (4,600 m) or higher. NATO reportedly fired 743 HARMs during the course of the 78-day campaign, but could confirm the destruction of only 3 of the original 25 SA-6 batteries. Over 800 SAMs were fired by Yugoslav forces at NATO aircraft, including 477 SA-6s and 124 confirmed MANPADS, for the downing of only two aircraft and several more damaged.

According to a post-conflict US intelligence report, Yugoslav military had a spy in NATO's headquarters in Brussels who in the early part of the conflict leaked flight plans and target details to the Yugoslav military, allowing Yugoslav military assets to move to avoid detection. Once NATO limited the number of people with access to its plans, the effect on "what the Serbs appeared to know" was immediate. The identity and nationality of the suspected 'spy' was not stated.

While not directly related to the hostilities, on 12 March 1999 the Czech Republic, Hungary, and Poland joined NATO by depositing instruments of accession in accordance with Article 10 of the North Atlantic Treaty at a ceremony in Independence, Missouri. These nations did not participate directly in hostilities.

A large element of the operation was the air forces of NATO, relying heavily on the US Air Force and Navy using the F-16, F-15, F-117, F-14, F/A-18, EA-6B, B-52, KC-135, KC-10, AWACS, and JSTARS from bases throughout Europe and from aircraft carriers in the region.

The French Navy and Air Force operated the Super Etendard and the Mirage 2000. The Italian Air Force operated with 34 Tornado, 12 F-104, 12 AMX, 2 B-707, the Italian Navy operated with Harrier II. The UK's Royal Air Force operated the Harrier GR7 and Tornado ground attack jets as well as an array of support aircraft. Belgian, Danish, Dutch, Norwegian, Portuguese and Turkish Air Forces operated F-16s. The Spanish Air Force deployed EF-18s and KC-130s. The Canadian Air Force deployed a total of 18 CF-18s, enabling them to be responsible for 10% of all bombs dropped in the operation.

The fighters were armed with both guided and unguided "dumb" munitions, including the Paveway series of laser-guided bombs. The bombing campaign marked the first time the German Air Force actively attacking targets since World War II.

The US B-2 Spirit stealth bomber saw its first successful combat role in Operation Allied Force, striking from its home base in the contiguous United States.

Even with this air power, noted a RAND Corporation study, "NATO never fully succeeded in neutralising the enemy's radar-guided SAM threat".

Operation Allied Force incorporated the first large-scale use of satellites as a direct method of weapon guidance. The collective bombing was the first combat use of the Joint Direct Attack Munition JDAM kit, which uses an inertial-guidance and GPS-guided tail fin to increase the accuracy of conventional gravity munitions up to 95%. The JDAM kits were outfitted on the B-2s. The AGM-154 Joint Standoff Weapon (JSOW) had been previously used in Operation Southern Watch earlier in 1999.

NATO naval forces operated in the Adriatic Sea. The Royal Navy sent a substantial task force that included the aircraft carrier HMS Invincible, which operated Sea Harrier FA2 fighter jets. The RN also deployed destroyers and frigates, and the Royal Fleet Auxiliary (RFA) provided support vessels, including the aviation training/primary casualty receiving ship RFA Argus. It was the first time the RN used cruise missiles in combat, fired from the nuclear fleet submarine HMS Splendid.

The Italian Navy provided a naval task force that included the aircraft carrier Giuseppe Garibaldi, a frigate (Maestrale) and a submarine (Sauro class).

The United States Navy provided a naval task force that included the aircraft carrier USS Theodore Roosevelt, USS Vella Gulf, and the amphibious assault ship USS Kearsarge.

The French Navy provided the aircraft carrier Foch and escorts. The German Navy deployed the frigate Rheinland-Pfalz and Oker, an Oste-class fleet service ship, in the naval operations.

The Netherlands sent the submarine HNLMS Dolfijn to uphold trade embargoes off the coast of Yugoslavia.

NATO ground forces included a US battalion from the 505th Parachute Infantry Regiment, 82nd Airborne Division. The unit was deployed in March 1999 to Albania in support of the bombing campaign where the battalion secured the Tirana airfield, Apache helicopter refueling sites, established a forward-operating base to prepare for Multiple Launch Rocket System (MLRS) strikes and offensive ground operations, and deployed a small team with an AN/TPQ-36 Firefinder radar system to the Albania/Kosovo border where it acquired targets for NATO air strikes. Immediately after the bombing campaign, the battalion was refitted back at Tirana airfield and issued orders to move into Kosovo as the initial entry force in support of Operation Joint Guardian. Task Force Hawk was also deployed.

Task Force Hunter, a US surveillance unit based upon the IAI RQ-5 Hunter drone "A" Company from a Forces Command (FORSCOM) Corps Military Intelligence Brigade (MI Bde) was deployed to Camp Able Sentry, Macedonia, in March, to provide real-time intelligence on Yugoslav forces inside Kosovo. They flew a total of 246 sorties, with five drones lost to enemy fire. A German Army drone battery based at Tetovo was tasked with a similar mission. German forces used CL-289 UAVs from December 1998 to July 1999 to fly 237 sorties over Yugoslav positions, with six drones lost to hostile fire.

Human Rights Watch concluded "that as few as 489 and as many as 528 Yugoslav civilians were killed in the ninety separate incidents in Operation Allied Force". Refugees were among the victims. Between 278 and 317 of the deaths, nearly 60 percent of the total number, were in Kosovo. In Serbia, 201 civilians were killed (five in Vojvodina) and eight died in Montenegro. Almost two-thirds (303 to 352) of the total registered civilian deaths occurred in twelve incidents where ten or more civilian deaths were confirmed.

Military casualties on the NATO side were limited. According to official reports, the alliance suffered no fatalities from combat operations. However, on 5 May, an American AH-64 Apache crashed and exploded during a night-time mission in Albania. The Yugoslavs claimed they shot it down, but NATO claimed it crashed due to a technical malfunction. It crashed 40 miles from Tirana, killing the two crewmen, Army Chief Warrant Officers David Gibbs and Kevin Reichert. It was one of two Apache helicopters lost in the war. A further three US soldiers were ambushed and taken as prisoners of war by Yugoslav special forces while riding on a Humvee on a surveillance mission along the Macedonian border with Kosovo. A study of the campaign reports that Yugoslav air defences may have fired up to 700 missiles at NATO aircraft, and that the B-1 bomber crews counted at least 20 surface-to-air missiles fired at them during their first 50 missions. Despite this, only two NATO manned aircraft (one F-16C and one F-117A Nighthawk) were shot down. A further F-117A Nighthawk was damaged by hostile fire as were two A-10 Thunderbolt IIs. One AV-8B Harrier crashed in the Adriatic Sea due to technical failure. NATO also lost 25 UAVs, either due to enemy action or mechanical failure. Yugoslavia's 3rd Army commander, Lt. Gen. Nebojsa Pavkovic, claimed that Yugoslav forces shot down 51 NATO aircraft, though no other source verified these numbers.

In 2013, Serbia's then-defence minister Aleksandar Vučić announced that the combined Yugoslav military and law enforcement casualties during the air campaign amounted to 956 killed and 52 missing. Vučić stated that 631 soldiers were killed and a further 28 went missing, and that 325 policemen were also among the dead with a further 24 listed as missing. The government of Serbia also lists 5,173 combatants as having been wounded. In early June 1999, while the bombing was still in progress, NATO officials claimed that 5,000 Yugoslav troops had been killed in the bombing and a further 10,000 wounded. NATO later revised this estimation to 1,200 soldiers and policemen killed.

Throughout the war; 181 NATO strikes were reported against tanks, 317 against armoured personnel vehicles, 800 against other military vehicles, and 857 against artillery and mortars, after a total of 38,000 sorties, or 200 sorties per day at the beginning of the conflict and over 1,000 at the end of the conflict. When it came to alleged hits, 93 tanks (out of 600), 153 APCs, 339 other vehicles, and 389 artillery systems were believed to have been disabled or destroyed with certainty. The Department of Defence and Joint Chief of Staff had earlier provided a figure of 120 tanks, 220 APCs, and 450 artillery systems, and a Newsweek piece published around a year later stated that only 14 tanks, 12 self-propelled guns, 18 APCs, and 20 artillery systems had actually been obliterated, not that far from the Yugoslavs' own estimates of 13 tanks, 6 APCs, and 6 artillery pieces. However, this reporting was heavily criticised, as it was based on the number of vehicles found during the assessment of the Munitions Effectiveness Assessment Team, which wasn't interested in the effectiveness of anything but the ordnance, and surveyed sites that hadn't been visited in nearly three-months, at a time when the most recent of strikes were four-weeks old. The Yugoslav Air Force also sustained serious damage, with 121 aircraft destroyed (according to NATO).

Operation Allied Force inflicted less damage on the Yugoslav military than originally thought due to the use of camouflage and decoys. "NATO hit a lot of dummy and deception targets. It's an old Soviet ploy. Officials in Europe are very subdued", noted a former senior NATO official in a post-war assessment of the damage. Other misdirection techniques were used to disguise targets including replacing the batteries of fired missiles with mock-ups, as well as burning tires beside major bridges and painting roads in different colors to emit varying degrees of heat, thus guiding NATO missiles away from vital infrastructure. It was only in the later stages of the campaign that strategic targets such as bridges and buildings were attacked in any systematic way, causing significant disruption and economic damage. This stage of the campaign led to controversial incidents, most notably the bombing of the People's Republic of China embassy in Belgrade where three Chinese reporters were killed and twenty injured, which NATO claimed was a mistake.

Relatives of Italian soldiers believe 50 of them have died since the war due to their exposure to depleted uranium weapons. UNEP tests found no evidence of harm by depleted uranium weapons, even among cleanup workers, but those tests and UNEP's report were questioned in an article in Le Monde diplomatique.

In April 1999, during the NATO bombing, officials in Yugoslavia said the damage from the bombing campaign cost around $100 billion up to that time.

In 2000, a year after the bombing ended, Group 17 published a survey dealing with damage and economic restoration. The report concluded that direct damage from the bombing totalled $3.8 billion, not including Kosovo, of which only 5% had been repaired at that time.

In 2006, a group of economists from the G17 Plus party estimated the total economic losses resulting from the bombing were about $29.6 billion. This figure included indirect economic damage, loss of human capital, and loss of GDP.

The bombing caused damage to bridges, roads and railway tracks, as well as to 25,000 homes, 69 schools and 176 cultural monuments. Furthermore, 19 hospitals and 20 health centers were damaged, including the University Hospital Center Dr Dragiša Mišović. NATO bombing also resulted in the damaging of medieval monuments, such as Gračanica Monastery, the Patriarchate of Peć and the Visoki Dečani, which are on the UNESCO's World Heritage list today. The Avala Tower, one of the most popular symbols of Belgrade, Serbia's capital, was destroyed during the bombing.

The use of Depleted Uranium ammunition was noted by the UNEP, which cautioned about the risks for future groundwater contamination and recounted the "decontamination measures conducted by Yugoslavian, Serbian and Montenegrin authorities." In total, between 9 and 11 tonnes of depleted uranium munitions were dropped across all of Yugoslavia, with payloads delivered by A-10 Thunderbolts and Tomahawk cruise missiles. In 2001, a study of uranium content across soil samples across Yugoslavia discovered highest concentration at Cape Arza, an area of land at the entrance to the Bay of Kotor. Between 90 and 120 kilograms of depleted uranium was dropped on Cape Arza, despite the location being abandoned since World War One.

In early June, a Finnish-Russian mediation team headed by Martti Ahtisaari and Viktor Chernomyrdin traveled to Belgrade to meet with Milošević for talks on an agreement that would suspend air strikes. When NATO agreed Kosovo would be politically supervised by the United Nations, and that there would be no independence referendum for three years, the Yugoslav government agreed to withdraw its forces from Kosovo, under strong diplomatic pressure from Russia, and the bombing was suspended on 10 June. The Yugoslav Army and NATO signed the Kumanovo Agreement. Its provisions were considerably less draconian than what was presented at Rambouillet, most notably Appendix B was removed from the agreement. Appendix B called for NATO forces to have free movement and to conduct military operations within the entire territory of Yugoslavia (including Serbia). The Yugoslav government had used it as a primary reason why they had not signed the Rambouillet accords, viewing it as a threat to its sovereignty.