It trained in photographic reconnaissance under Second Air Force in Colorado and Oklahoma.

Established in late 1947 as a B-17 Flying Fortress heavy bomb squadron; trained under Second Air Force.

Established as a B-29 Superfortress heavy bomb group in early 1944; trained under Second Air Force in Nebraska.

Established in late 1942 as a P-38 Lightning fighter squadron, trained under Second Air Force in the pacific northwest.

Established in mid-1943 as a B-24 Liberator heavy bombardment group; trained under Second Air Force.

Established in late 1943 as a B-24 Liberator heavy bomb squadron; trained under Second Air Force.

Established as a B-17 Flying Fortress heavy bomber squadron, trained under Second Air Force.

Trained under Second Air Force.

Established in early 1943 as the 26th Photographic Reconnaissance Squadron, trained under Second Air Force.

Trained under Second Air Force for an extended period due to Boeing technicians making modifications of B-29 aircraft.