 Unlike the F-111, its variable-sweep wings were programmed automatically by speed and could be moved even during turns.In air combat, the wings could be swept forward for tight "bat" turns and back for dash speeds.Rockwell adopted variable geometry for the much larger Advanced Manned Strategic Bomber (AMSA) program that produced the B-1 Lancer bomber, intended to provide an optimum combination of high-speed cruising efficiency and fast, supersonic penetration speeds at extremely low level.