The 397th Bombardment Squadron, designated the 7th Reconnaissance Squadron from September 1937 to December 1939, 7th Reconnaissance Squadron (Medium Range) from December 1939 to November 1940, and 7th Reconnaissance Squadron (Heavy) from November 1940 to April 1943
The Sabre Squadron | No. 33 Squadron RAF | No. 263 Squadron RAF | squadron | Pacific Squadron | No. 45 Squadron RAF | No. 127 Squadron RAF | No. 617 Squadron RAF | No. 43 Squadron RAF | No. 38 Squadron RAF | No. 107 Squadron RAF | German East Asia Squadron | Far East Squadron | Squadron (aviation) | No. 77 Squadron RAAF | No. 71 Squadron RAF | No. 49 Squadron RAF | No. 48 Squadron RAF | No. 2 Squadron RAF | No. 233 Squadron RAF | No. 133 Squadron RAF | Asiatic Squadron | 44th Fighter Squadron | 24th Tactical Air Support Squadron | 160th Fighter Squadron | Volunteer Gliding Squadron | Squadron Sinister | No. 65 Squadron RAF | No. 64 Squadron RAF | No. 614 Squadron RAF |
The first United States air units arrived in the Canal Zone in February 1917, with the 7th Aero Squadron being organized on 29 March at Ancon.