Bell AH-1S Cobra

The US Army upgraded the AH-1G (and its modernization AH-1Q and AH-1R ) with a three step program called AH-1S.

- Production AH-1S ( AH-1S Prod ) : 100 new built in 1977/78 with a seven-plane semiflat crew canopy and TOW missiles. Redesignated AH-1P

- AH-1S Upgunned : 98 new built in 1978/79 equipped with the Enhanced Cobra Armament System (ECAS). Redesignated AH-1E

- AH-1S Modernized : 140 new built in 1979/81 and 387 conv from AH-1G/Q/R. Redesignated AH-1F