Since San Antonio's founding as a presidio more than two centuries ago, the military has been an integral part of the city. Most military installations require a visitor's pass, which usually may be obtained at the gate. For security reasons, some areas are restricted.

Brooks Air Force Base - Founded in 1918 and scene of history's first mass paratroop drop. Includes USAS School of Aerospace Medicine, Air Force Medical Support Agency, the Air Force Center for Environmental Excellence, among others. It is a blending of scientific medical, environmental, acquisition and instructional expertise.

Fort Sam Houston- Established in 1845 in the Alamo complex and moved to its present location in 1876, this installation has long been one of the Army's most important installations. As the "Home of Army Medicine," the post includes the Headquarters, U.S. Army Medical Command, the Army Medical Department Center and School, and Brooke Army Medical Center.

Fort Sam Houston Museum - Chronicles the growth and development of the Army in San Antonio from 1845, when the post occupied the historic Alamo, up to the present. Exhibits depict important events and some of the distinguished Americans who lived here, including John J. Pershing and Dwight D. Eisenhower. Featured are the Buffalo Soldiers, the Rough Riders, and the Birth of Military Aviation. Self-guided tour maps of the historic sites on post are available. Open Wed. - Sun. 10 a.m. - 4 p.m. Building 123 on Stanley Rd. For information, call 210/221-1886.

U.S. Army Medical Department Museum - Museum depicts the history of military medicine since 1775. Exhibits chronicle the progress of the medical arts and science which conserve the fighting strength of the Army and their impact on American society. The contributions of distinguished Army doctors such as Walter Reed are featured. Open Tues. - Sat. 10 a.m. - 4 p.m. Building 1046 at the intersection of Stanley Road and Harry Wurzbach Highway. For information, 210/221-6358.

Lackland Air Force Base- History and Traditions Museum is open Mon. - Fri. (except holidays) and is free to the public. Collections include aircraft equipment dating from World War I to current jet engines and aircraft displays.

Randolph Air Force Base - Official Air Force Records Center, also provides pilot training. The base's famous landmark, dubbed the "Taj Mahal," has become a symbol of professional flight training to thousands of Air Force pilots.