The Bell Model 409/YAH-63 was an experimental attack helicopter for the Advanced Attack Helicopter (AAH) competition. Hughes' Model 77/YAH-64, later developed into the AH-64 Apache, was selected over

During the mid-1960s, United States Army initiated the Advanced Aerial Fire Support System (AAFSS) program to develop the Lockheed AH-56 Cheyenne for the anti-tank gunship role. The U.S. Army pursued