Headquarters European Theater of Operations US Army (ETOUSA) was established in London by General Order 3, ETOUSA on 8 June 1942. It succeeded Headquarters US Army in the British Isles (USAFBI), established in London by General Order 1, USAFBI, 8 January 1942.



Until the establishment of Supreme Headquarters Allied Expeditionary Force (SHAEF) on 13 February 1944, ETOUSA participated in operational planning for Allied invasion of western Europe. It performed administrative and service functions for U.S. Army troops, equipment, and facilities in the following areas:

-United Kingdom and Iceland 1942-45

-North Africa November 1942-February 1943

-Western Europe, 6 June 1944- 1 July 1945



ETOUSA's Headquarters moved from London to Valognes, France on 1 September 1944; and to Paris on 14 September 1944. It was redesignated HQ USFET, with main headquarters at Frankfurt, Germany, and rear headquarters at Paris, on 1 July 1945, by General Order 130, HQ ETOUSA, 20 June 1945.