 Convair selected the coleopter layout for their Model 49 proposal, entered into the Advanced Aerial Fire Support System (AAFSS).AAFSS asked for a new high-speed helicopter design for the attack and escort roles, and gathered an impressive array of gyrodynes, dual-rotor designs and similar advances on conventional designs, but nothing was as unconventional as the Model 49.The Army "went conventional" however, and selected the Lockheed AH-56 Cheyenne and Sikorsky S-66 for further development.