An underground complex, built by the Department of Defense as an emergency shelter and electronic control center. Located underneath 650 acres in the hills near the Pennsylvania/Maryland border, Raven Rock, AKA "Site R", reportedly had a full-time staff of 350 for much of the Cold War. Officially now called the Alternate Joint Communications Center, the bunker went on-line in 1954. Representatives of all the military departments and the Joint Chiefs of Staff for the federal government were reportedly located here as a contingency against a wipeout of the command structure in the event of a nuclear war. The site has 700,000 square feet of interior space, and enough room for 3,000 people. A new tenant is the Defense Information Systems Agency, Western Hemisphere, which operates the communication and command center located in the bunker. It is still used as a Continuity of Government location, and Dick Cheney is said to have stayed here after the September 11, 2001 terrorist attack. Site R was supported by nearby Fort Ritchie, MD, a 638 acre Army post, with over 2,000 employees. It is now administered out of Fort Detrick, MD.
Raven Rock Underground Command Center (Site R), Pennsylvania