United States. War Department
Organization
Dates
- Existence: 1789 - 1947
- Usage: 1789 - 1949
Historical Note
The War Department existed from 1789 until September 18, 1947, when it split into Department of the Army and Department of the Air Force and joined the Department of the Navy as part of the new joint National Military Establishment (NME), renamed the United States Department of Defense in 1949.