The Boeing short-range attack missile (SRAM) first was deployed as a strategic weapon to be carried by FB-111A and B-52 manned bombers. The missiles are small, so many can be carried by each bomber and can fly at subsonic or supersonic speeds. SRAM's guidance systems allow for individually programmed flights, and they can change direction after they have been launched. By the time the last of 1,500 SRAMs rolled out of assembly in 1975, they were a key element in the Strategic Air Command's weapon inventory.