In 1965 Lockheed and Sikorsky Aircraft won the Project Definition Phase of the US Army Advanced Aerial Fire Support System . Lockheed was chosen the following year to produce 10 prototypes of their compound helicopter with a rigid rotor. This was the number 6 aircraft that did weapons trials at the Yuma Proving Grounds in Arizona. It was also the only Cheyenne painted in this variegated camouflage scheme. The helicopter is presently on display at Fort Campbell, KY.