In my opinion, to go with the future RM huey it would be great to have early AH-1G and late cobras AH-1S Cobra.
In 1976 the US Army upgraded the AH-1G with a three step program called AH-1S.
The Bell AH-1 Cobra is a two-blade rotor, single-engine attack helicopter manufactured by Bell Helicopter. It was developed using the engine, transmission and rotor system of the Bell UH-1 Iroquois. A member of the prolific Huey family, the AH-1 is also referred to as the HueyCobra or Snake.
By June 1967, the first AH-1G HueyCobras had been delivered.