In 1972, the Army conducted an evaluation between the Bell Model 309 KingCobra, the Lockheed Cheyenne and Sikorsky S-67 in a competitive fly-off, beginning in the spring of 1972 and was completed in July.
The Army conducted an evaluation between the Bell Model 309 KingCobra beginning in the spring of 1972. This was in 1972. This was the Lockheed Cheyenne and Sikorsky S-67 in a competitive fly-off. The Army was completed in July. This was in 1972.