The Soviet shoulder-launched SA-7b Grail surface to air missile (SAM) proved very effective against low-flying aircraft. This heat-seeking SAM forced FACs to fly much higher to stay out of range. Since the OV-10’s twin engines produced a large amount of heat, the OV-10 FACs had to fly above 9,500 feet. A communist soldier using an SA-7 Grail. (U.S. Air Force photo)
