Raven Rock Mountain Complex (Site R)

The Raven Rock Mountain Complex, commonly known as Site R, is a highly secure military installation located in Pennsylvania, near the Maryland border. Constructed in the early 1950s during the Cold War, the facility was designed as an alternate command center for the United States military and government in the event of a nuclear attack. Site R serves as a backup to the Pentagon, housing operations centers for the Department of Defense, including the Alternate National Military Command Center (ANMCC). Over the decades, it has remained a vital component of U.S. strategic continuity planning, adapting to evolving threats and technological advancements.