Camp Bullis Military Training Reservation is a U.S. Army training camp comprising 27,990 acres (113.3 km) in Bexar County, Texas, United States, just northwest of San Antonio. Camp Bullis provides base operations support and training support to Joint Base San Antonio. The camp is named for Brigadier General John L. Bullis.

Camp Bullis and Camp Stanley make up the Leon Springs Military Reservation. Camp Bullis is used primarily as maneuvering grounds for U.S. Army, Air Force, and Marine combat units. It is also used as a field-training site for the various medical units stationed at Brooke Army Medical Center in nearby Fort Sam Houston.

In 1906, United States military bought over 17,000 acres from all or parts of six ranches. This area was designated the Leon Springs Military Reservation and was to be used as a maneuvers and training area for troops based at Fort Sam Houston in San Antonio. Leon Springs was praised for its sparse population and varied terrain. Use of the new training area began almost immediately. In July and August 1907, the target ranges in present-day Camp Stanley were used for the Southwestern Rifle and Pistol Competition. The first major maneuvers were held in 1908, involving regular army and National Guard infantry, cavalry, and field-artillery units. The first documented firing of artillery occurred in 1909. Mobilization of troops in response to upheavals in Mexico in 1911 led to large-scale maneuvers at the reservation. With the increased tensions along the United States-Mexico border between 1912 and 1916, activity at the reservation decreased as troops from Fort Sam Houston were deployed along the border. Activity increased again in 1916, as large numbers of troops were called up for training after the raid of Columbus, New Mexico, by Pancho Villa. Also in 1916, a large remount station was built near Anderson Hill in present-day Camp Stanley. In February 1917, the facilities at the reservation were renamed Camp Funston in honor of Major General Frederick Funston. In May 1917 while preparing for World War I, Camp Funston established the first Officers Training Camp. Drills and training there included practice marches, target practice, and trench warfare training. Officers graduated in August 1917, after which a second series Officer Training Camp began.

In October 1917, Camp Funston was renamed Camp Stanley to avoid confusion with Camp Funston in Kansas; additional land to the south was leased and named Camp Bullis in honor of Brigadier General John L. Bullis. The Camp Bullis cantonment was located across Salado Creek from the old Scheele Ranch. Training facilities at Camp Bullis included cavalry camps, maneuver grounds, and target ranges. Construction of permanent facilities was limited to a camp headquarters, an administrative building, and spaces for rows of mess halls and tents. The 315th Engineer Regiment of the 90th Division constructed rifle ranges and a pistol range between Hogan Ridge and Salado Creek that could easily accommodate 3,000-4,000 men.

Between World Wars I and II, Camp Bullis grew significantly in size. The leased properties of Camp Bullis and additional adjacent properties were purchased. In addition, 1,760 acres of Camp Stanley, primarily the inner cantonment of present-day Camp Stanley, were transferred to the chief of ordnance for the San Antonio Arsenal, which was located in the city of San Antonio to the south. The remaining area, formerly known as the Leon Springs Military Reservation, was transferred to Camp Bullis. During this period, infantry and engineering units of the 2d Division and other troop units in the San Antonio area used Camp Bullis. Training and drills by the Citizens Military Training Camp and the Reserve Officers Training Corps also took place at Camp Bullis. Troops took part in target and combat practice, firing Stokes mortars, and maneuvering in regiment-sized units.

Starting in 1937, the Second Division tested new divisional structures meant to increase mobility and flexibility through mechanization and motorization. These tests, featured in a 1939 Life issue and employed the use of antitank units and the 6th Infantry Regiment, and lasted through 1939. The resulting concept, known as the triangular division, was built around three infantry regiments and gave commanders at each level of organization, from platoon to division, three forces to face enemy units - one to confront the enemy, one to maneuver and outflank the enemy, and one to exploit enemy failures or weaknesses and act as a reserve. In 1939, Army Chief of Staff General George C. Marshall ordered that the triangular division design be adopted for all infantry divisions. The formal reorganization of the Second Division included the addition of the 38th Infantry Regiment, two artillery battalions, and a change from 75-mm to 105-mm howitzers.

In 1942 and 1943, the triangular division was replaced when the need for tank and other armored units became essential parts of division-sized units.

Prior to World War II, Camp Bullis had hosted a number of nonmilitary activities. In 1926, portions of two movies—The Rough Riders and Wings—were filmed at the installation. The Rough Riders was filmed using troops of the 1st and 5th Cavalry regiments as extras. Palmtree Hill, which was stormed by the troops, was planted with palm trees to resemble San Juan Hill in Cuba. The flying fields at Camp Bullis were used in the production of Wings, the winner of the first Academy Award for best picture. In the early 1930s, Camp Bullis was one of many military installations across the country used for the organization of Civilian Conservation Corps (CCC) personnel. Personnel from the CCC, as well as the Works Progress Administration (renamed Work Projects Administration in 1939), participated in the construction of some of the camp's facilities during this period.

As the war in Europe began, more troops trained at Camp Bullis. This increased the need for a larger training facility that could accommodate more than one division. Properties to the east along Blanco Road and to the northwest were acquired by condemnation, and additional acreage north of Cibolo Creek was leased. The new facilities reflected changes in technology, tactics, and increased range of weapons. In addition, adding more tent slabs increased the capacity of the cantonment area. A prisoner-of-war camp with a capacity for 200 prisoners was established north of the headquarters, and access to the camp was improved by the completion of Military Highway. Division-sized units trained at Camp Bullis until November 1943, after which the army did not activate any new divisions. Smaller units continued to train at Camp Bullis until the end of World War II. Toward the end of World War II, the Provost Marshal General School, including the Military Police Officer Candidate School, moved to Camp Bullis from Fort Sam Houston.

After World War II, demand decreased for the ranges and maneuver areas. The postwar period brought changes in infantry division weaponry that were incompatible with the size and location of the facility. Divisions used late-model M-4 Shermans and M-26 Pershings, as well as antiaircraft artillery, which "could not be fired safely at Camp Bullis with service ammunition" Other developments at the end of the war made Camp Bullis an ideal facility for different activities. Personnel attached to the Government Tire Test used Camp Bullis and its shop facilities to design and test tires, fuels, vehicles, and tanks for the military. Medical training also became increasingly important, as Fort Sam Houston became the new home of the Medical Field Service School. Remote training facilities were set up at Camp Bullis so personnel could practice field medical skills.

Camp Bullis continues to train medical personnel in field procedures, as well as provide training facilities for Army, Army Reserve, Air Force, and Texas National Guard personnel from the San Antonio area and outside the region. Since 1970, Camp Bullis has transferred 464 acres to the City of San Antonio and Bexar County for parks and roads.

As of September 2015, the San Antonio Water System planned an $11 million project to build nearly 4 miles of pipeline to Camp Bullis, Fort Sam Houston, and Lackland Air Force Base as a backup water supply. This was to prevent San Antonio from becoming a candidate for the next round of Base Closure and Realignment Commission decisions.

The Soldier Medic Training Site is located at Camp Bullis. It is designed to simulate conditions that new soldier medics are likely to face while deployed to current areas of conflict.

Residents of Camp Bullis (that is, dependent children of people in the military) are in the Fort Sam Houston Independent School District.

• Texas Military Forces
• Texas Military Department
• List of conflicts involving the Texas Military
• Awards and decorations of the Texas Military

• Manguso, John M. (1990). Camp Bullis: Admirably Suited to All Purposes of Military Training: A History of the Leon Springs Military Reservation, 1890-1990. San Antonio, Texas: Fort Sam Houston Museum. OCLC 25665465.
• Freeman, Martha Doty (1994c). Camp Bullis: A military training facility in the Southern Department and Eighth Corps Area, 1096-1946. Fort Worth, Texas: Komatsu/Rangel, Inc. OCLC 32450435.
• Hawkins, Glen R; Carafano, James Jay (1997). Prelude to Army XXI: U.S. Army Division Design Initiatives and Experiments, 1917-1995. Washington, D.C.: Center of Military History. OCLC 36313170.
• Cestaro, Gregg C.; Freeman, Martha Doty; Blake, Marie E.; Scott, Ann M. (April 2001). Cultural Resources Survey Of Selected Maneuver Areas at Camp Bullis, Bexar and Comal Counties, Texas: The Archeology and History of 3,255 Acres Along Cibolo Creek (PDF). Austin, Texas: Prewitt and Associates, Inc. Cultural Resources Services.

• Official website
• http://www.globalsecurity.org/military/facility/camp-bullis.htm
• https://web.archive.org/web/20080112111145/http://www.cs.amedd.army.mil/Bullistraining/