map The Munitions Building, constructed in 1918, contained of space across three stories and was designed to provide temporary accommodations for 9,000 Department of War employees. During World War I, the War Department had greatly expanded. By the end of the war, the Main Navy and Munitions Building together housed 14,000 military personnel, including the
Secretary of the Navy. Small exhibits were on display in the corridors of the Munitions Buildings, showing military uniforms, types of gas masks, military daily rations, and Army photographs. At the end of World War I, the Munitions Building housed technical branches, including the
Quartermaster General,
United States Army Corps of Engineers,
Ordnance Corps,
Chemical Warfare Service,
Signal Corps, and
Army Air Service. In March 1923, the Army's Finance Office also moved into the Munitions Building. In February 1924, plans were put forth to build an oil steam plant for the Main Navy and Munitions Building. In November 1933, the
Army Inspector General's office, along with the Organized Reserves, the welfare section of the Secretary's office, and the Office of Chief of Chaplains moved into the Munitions Building. The
National Guard Bureau also was housed in the Munitions Building, as was the
Army Industrial College.
Headquarters , in 1919 At the time when the Munitions Building was constructed, the War Department was headquartered in the
State-War-Navy Building, which was completed in 1888 and located on 17th Street NW, next to the
White House. By the 1930s, the War Department was being squeezed out by the
Department of State, and the White House also needed additional office space. In August 1939, Secretary of War
Harry H. Woodring, along with Acting Chief of Staff of the Army
George C. Marshall, moved his office into the Munitions Building. In the late 1930s, a
new War Department Building was constructed at 21st and C Streets in
Foggy Bottom. Still, upon completion, the new building did not solve the department's space problem and ended up being used by the Department of State. To help deal with the space shortage, a fourth story was added to the Main Navy and Munitions Buildings during
World War II. Coming into office, with World War II breaking out in Europe, Secretary of War
Henry L. Stimson was faced with the situation of the War Department spread out in numerous buildings across Washington, D.C.,
Maryland and
Virginia, and the Munitions Building was overcrowded. On 28 July 1941,
Congress authorized funding for a new Department of War building in
Arlington, Virginia, which would house the entire department under one roof. When office space became available in 1942 at
the Pentagon, in the first completed wing, the Secretary of War vacated the Munitions Building and moved to the Pentagon. The Department of War vacated the Munitions Building in 1943 once the Pentagon was constructed. The Department of Navy took over the Munitions Building once the Department of War relocated out of the building and placed the Navy's Material Systems Command offices in the Munitions Building.
World War II The
Signal Intelligence Service was located in the Munitions Building during the early years of
World War II. In September 1939, the Signal Intelligence Service was able to break Japan's cipher,
Purple. The Department of War continued to receive intercepted messages, codenamed
Magic, including final messages to the Japanese Embassy in Washington before the
Attack on Pearl Harbor. ==Main Navy==