sentences:  This was increased to half the squadron's aircraft in 1962.The 4239th (and later the 449th) continued to maintain an alert commitment until the 449th was inactivated in 1977.In 1962, the wing's bombers began to be equipped with the GAM-77 Hound Dog and the GAM-72 Quail air-launched cruise missiles, The 4239th Airborne Missile Maintenance Squadron was activated in November to maintain these missiles.