The Advanced Attack Helicopter (AAH) was a United States Army program to develop an advanced ground attack helicopter beginning in 1972. The Advanced Attack Helicopter program followed cancellation of the Lockheed AH-56 Cheyenne. After evaluating industry proposals, the AAH competition was reduced to offerings from Bell and Hughes. Following a flight test evaluation of prototypes, Hughes' YAH-64 was selected in December 1976.
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