US Bomb, 1000 lb GP, AN-M44, AN-M65, AN-M65A1
These bombs are all general purpose high explosive bombs.
The fuzing of these bombs is the same except that the Tail Fuzes AN-Mk 230 and Mods and Mk 240 Mod 0 can be used in the 1,000-pound GP Bomb AN-M65, since this bomb has the Adapter Booster M115 (or M115A1).
The 1,000-pound GP Bombs AN-M44, AN-M65, and AN-M65A1 differ in the adapter booster which is employed in the base plate to receive the tail fuze. The AN-M44 uses the Adapter Booster M102; the AN-M65 uses the Adapter Booster M115; and the AN-M65A1 uses the Adapter Booster M115A1.
Collaborative Ordnance Data Repository