The 20th Bomb Squadron (20 BS) is a unit of the United States Air Force 2d Operations Group located at Barksdale Air Force Base, Louisiana. The 20th is equipped with the B-52H Stratofortress. Formed in June 1917, the 20 BS saw combat on the World War I Western Front, in France. It took part in the St. Mihiel offensive and Meuse-Argonne offensive. Later, it served with the Army Air Service and Army Air Corps in the Inter-War period. During the 1920s and 1930s, the squadron was involved in flight field service testing of new bomber aircraft, notably the Y1B-17 Flying Fortress. During World War II fought in the North African and Italian Campaigns. It was a part of Strategic Air Command during the Cold War, deploying frequently to perform Arc Light bombing missions in Indochina. Since 1993, th