The AH-1 was developed using the engine, transmission and rotor system of the Bell UH-1 Iroquois, which had proven itself to be a capable platform during the Vietnam War. It was produced in response to fulfil a need for a dedicated armed escort for transport helicopters to give the latter greater survivability in contested environments. Accordingly, the AH-1 was a dedicated attack helicopter, featuring a tandem cockpit, stub wings for weapons, and a chin-mounted gun turret. The first examples of the type entered service with the United States Army during 1967; other branches of the US military also opted to acquire the type, particularly the United States Marine Corps, while export sales were made to numerous overseas countries, including Israel, Japan, and Turkey.