United States Department of War

United States Department of War

Seal of the U.S. Department of War
Department overview
Formed	August 7, 1789; 235 years ago (1789-08-07)
Preceding department	Board of War and Ordnance
Dissolved	September 18, 1947; 77 years ago (1947-09-18)
Superseding agencies	National Military Establishment Department of the Army Department of the Air Force
Department executive	Secretary of War
Child department	U.S. Army

The United States Department of War, also called the War Department (and occasionally War Office in the early years), was the United States Cabinet department originally responsible for the operation and maintenance of the United States Army, also bearing responsibility for naval affairs until the establishment of the Navy Department in 1798, and for most land-based air forces until the creation of the Department of the Air Force on September 18, 1947.

The secretary of war, a civilian with such responsibilities as finance and purchases and a minor role in directing military affairs, headed the War Department throughout its existence.

The War Department existed for 158 years, from August 7, 1789, to September 18, 1947,^[1] when it split into the Department of the Army and the Department of the Air Force under the National Security Act of 1947, joining the Department of the Navy to form the National Military Establishment (NME). In 1949, the NME was renamed the Department of Defense (DOD).