Medina Base National Stockpile Site, Building No. 400, West of I-410, south of U.S. Highway 90, San Antonio, Bexar County, TX

Significance: Building 400 is an "S" structure designed and constructed 1954-1955 at what was then the Medina Base National Stockpile Site. the Medina Base was built by the Atomic Energy Commission and the Armed Forces Special Weapons Project 1954-55 as one of thirteen installations where nuclear weapons components were stored, maintained, and assembled. The Medina Base was constructed during the second generation of these special weapons storage bases, which were commonly referred to as "Q" Areas. This designation was due to the requirement for personnel to have a "Q" level security clearance because of the secret nature of work that occurred at these areas.
Unprocessed Field note material exists for this structure: N1353
Survey number: HABS TX-3526-A
Building/structure dates: 1955 Initial Construction