The 640th initially flew sweeps over Occupied France from its base in England, attacking coastal defenses, V-1 flying bomb and V-2 rocket sites, airfields, and other targets in France in preparation for Operation Overlord, the invasion of Normandy.
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 |