In the montage of Army Air Corps airplanes shown near the end of the film there were two types that were already obsolete by 1941: the twin-engine Martin B-10 and the Boeing P-26. Both of these planes were no longer in operational squadrons and had been relegated to "hack" duties or service overseas in the Philippines or the Canal Zone. The Douglas A-17s were obsolescent and on their way out too. Only the four-engine Boeing B-17 was in first-line service at the time.