The squadron was first activated on 3 November 1942 at Gowen Field, Idaho as the 534th Bombardment Squadron, one of the four original squadrons of the 381st Bombardment Group. It gathered its initial cadre at Gowen, but only began training for combat with the Boeing B-17 Flying Fortress after moving to Pyote Army Air Field, Texas at the end of the year. On 8 May 1943, the ground echelon began moving to the port of embarkation at Camp Kilmer, New Jersey, and boarded the for the European Theater of Operations on 27 May. The air echelon marshalled at Salinas Army Air Field, Kansas and began movement by the North Atlantic Ferry Route on 15 May.Maurer, Combat Units, pp. 268-269Freeman, p. 253
