The AH-56 Cheyenne was a four-bladed, single-engine attack helicopter developed by Lockheed for the United States Army's Advanced Aerial Fire Support System program to produce the Army's first dedicated attack helicopter. Lockheed designed the AH-56 utilizing a rigid-rotor and configured the aircraft as a compound helicopter; with low-mounted wings and a tail-mounted thrusting propeller. The compound helicopter design was powered by a GE T64 turboshaft engine and was intended to provide a 212-knot dash capability in order to serve as an armed escort to the Army's transport helicopters, such as the UH-1 Iroquois.

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