Fort Belvoir is located at the southern end of Fairfax County, about 25 miles south of Washington, D.C. It is the largest employer in Fairfax County and has more personnel than the Pentagon.
The base was founded during World War I (then called Camp A.A. Humphreys after a Union Civil War general), and it was renamed Fort Belvoir (after the plantation originally there) in the 1930s.
Today, Fort Belvoir is home to the National Geospatial-Intelligence Agency, a new community hospital (which opened in 2011), and headquarters for the Defense Logistics Agency, Defense Acquisition University, United States Army Intelligence and Security Command, Missile Defense Agency, Defense Threat Reduction Agency and several others.
Communities adjacent to Fort Belvoir include Lorton and Newington, but many people who work at Fort Belvoir also live in Springfield, Burke and Woodbridge.