 As a result , the Army Material Command ( AMC ) conducted a study to determine if the development objectives were feasible and also established a program office for the Fire @-@ support Aerial System ( FAS ) . AMC recommended to narrow the competition to compound helicopters , as they were considered the only helicopter configuration at the time capable of being developed to meet the objectives . In March 1964 , the Secretary of the Army advised <unk> that modification of existing aircraft would not approach the required performance of the FAS program ; the Army would continue using the armed UH @-@ 1B until development of the FAS could proceed . 
