Funny story that wasn't funny at the time. We were flying the mighty whistlin shithouse (AC-130H) out of Guam practicing for the Iran hostage rescue. Our live fire range was basically a big rock sticking up out of the water somewhere near Guam. We were shooting our regular 20mm HEI rounds down at 2500ft. Bomb dump says they have a "shitload" of tracers they need to get rid of and ask if we can shoot it. We said sure, link it up, a mixture of tracer and HEI. So we are over this rock at 2500ft and the pilot lets loose with the first burst of the tweak, immediately followed by "CEASE FIRE, CEASE FIRE!!!!. Tracers were ricocheting back toward the airplane, some of them went past us.