Fort Knox is a United States Army post in Kentucky, south of Louisville and north of Elizabethtown. It is also adjacent to the United States Bullion Depository, which is used to house a large portion of the United States' official gold reserves. The 109,000 acre (170 sq mi, 441 km²) base covers parts of Bullitt, Hardin, and Meade counties. It currently holds the Army Human Resources Center of Excellence to include the Army Human Resources Command. It is named in honor of Henry Knox, Chief of Artillery in the American Revolutionary War and first United States Secretary of War.