Joint Base San Antonio Joint Base San Antonio ( JBSA ) is a United States military facility located in San Antonio , Texas , USA . The facility is under the jurisdiction of the United States Air Force 502d Air Base Wing , Air Education and Training Command ( AETC ) . The facility is an amalgamation of the United States Army Fort Sam Houston , the United States Air Force Randolph Air Force Base and Lackland Air Force Base , which were merged on 1 October 2010 . Overview . JBSA was established in accordance with congressional legislation implementing the recommendations of the 2005 Base Realignment and Closure Commission . The legislation ordered the consolidation of the three facilities which were adjoining , but separate military installations , into a single Joint Base , one of 12 formed in the United States as a result of the law . Joint Base San Antonio supports a population of 80 , 000 and supports students at three installations annually of up to 138 , 000 . Upon becoming the largest single DoD installation / enterprise , it has a total Plant Replacement Value of about 10 . 3 billion , lead a work force of over 8 , 000 personnel , manages an annual budget of 800 million , interface with 1 , 000 civic leaders of San Antonio , 20 smaller communities , four counties and four Congressional Districts , support more than 200 mission partners , supported and supporting units , and finally , support more than 250 , 000 other personnel including 425 retired general officers ( 2nd largest concentration in U . S . ) . Fort Sam Houston . The primary mission at Fort Sam Houston is as a medical training and support post . The 502d Mission Support Group performs the installation support mission . The post is the home of Army North , Army South , Army 5th Recruiting Brigade , Brooke Army Medical Center , the Institute of Surgical Research , the Army Medical Department Center and School , the Army Medical Command and the 502d Air Base Wing . Fort Sam Houston provides facilities and support for the activities of garrison units and other tenant organizations . The post also supports the thousands of Army Reserve and National Guard soldiers who train there year round . Soldiers from Fort Sam Houston have participated in every American War since 1845 and have deployed worldwide in support of post - Cold War contingency operations . Together with Camp Stanley , Camp Bullis is part of the Leon Springs Military Reservation . Camp Bullis has provided firing ranges , training areas and logistics support to Fort Sam Houston and other active and reserve component units in South Texas for nearly 100 years . Its most frequent users are the Army Medical Department Center and School , Defense Medical Readiness Training Institute , Air Force Ground Combat Skills School and Army units stationed at Fort Sam Houston . There are currently 130 military personnel stationed at Bullis . Lackland Air Force Base . Lackland Air Force Base is home to more than 120 Department of Defense and associate organizations , including the 37th Training Wing , the largest training wing in the U . S . Air Force . Lackland is the Air Force ' s only site for enlisted basic military training , and also offers professional and technical skills , and English language training for members of the U . S . Air Force , other military services , government agencies , and allies . Its four primary training functions graduate more than 86 , 000 students annually . The 802d Mission Support Group performs the installation support mission , supporting the 25 , 000 people at Lackland . The 802d MSG is the largest support group in CONUS . Its 2 , 300 personnel provide numerous services including security forces , protection , personnel services , communications , infrastructure support , lodging , recreational activities and food services . Other major tenants include Air Reserve Command ' s 433d Airlift Wing , the Texas Air National Guard 149th Fighter Wing , the 59th Medical Wing , the Air Force Intelligence , Surveillance and Reconnaissance Agency , and the 67th Network Warfare Wing . Randolph Air Force Base . Randolph is named after Captain William Millican Randolph , a native of Austin , who was on the base naming committee at the time of his death in a crash . It serves as headquarters of the Air Education and Training Command ( AETC ) as well as the Air Force Personnel Center ( AFPC ) and is known as " the Showplace of the Air Force " because of the Spanish Colonial Revival Style architecture in which all structures including hangars were constructed . The symbol of the base is a large water tower atop Building 100 , housing the headquarters for Randolph ' s major flying unit , the 12th Flying Training Wing ( 12 FTW ) . With its distinctive architecture , the wing ' s headquarters has come to be known throughout the Air Force as " the Taj Mahal , " or simply " The Taj " . Randolph Air Force Base is home to more than 30 Department of Defense units including Headquarters Air Education and Training Command , Air Force Personnel Center , Air Force Recruiting Service , and the 12th Flying Training Wing . The 902d Mission Support Group performs the installation support mission at Randolph . It is the focal point for all base activities . It is composed of the 902d Force Support Squadron ; the 902d Communications Squadron ; the 902d Civil Engineer Squadron ; the 902d Contracting Squadron ; the 902d Logistics Readiness Squadron , and 902d Comptroller Squadron . These units serve the needs of the wing and tenant units on the base , including more than 15 , 000 people on the base and more than 24 , 000 Air Force retirees in the local area . 502d Air Base Wing . The 502d Air Base Wing is a United States Air Force unit that provides installation support for Joint Base San Antonio . The 502d activated on 1 August 2009 . The wing ' s three Mission Support Groups perform the installation support mission at each major installation in the San Antonio area . The mission of the wing is to meet the needs of all three installations of JBSA , their missions and people and to optimize installation support while maximizing opportunities for greater joint military and community cooperation . This mission is carried out through the Mission Support Group located on each JBSA base . The 502d Air Base Wing previously functioned as the host unit for Maxwell Air Force Base from 1947 to 1 October 1994 when it inactivated .