Gunnery Sgt. Christopher Mulcahy, a combat marksmanship trainer instructor with Marine Light Attack Helicopter Training Squadron 303, fires an M134 GAU-17 Minigun during an aerial gunnery shoot at Marine Corps Base Camp Pendleton, California, Dec. 17. Marines with HMLAT-303 flew a formation flight and conducted an aerial gunnery to shoot give students the opportunity to refine basic skills needed to operate in the Fleet Marine Force. - Gunnery Sgt. Christopher Mulcahy, a combat marksmanship trainer instructor with Marine Light Attack Helicopter Training Squadron 303, fires an M134 GAU-17 Minigun during an aerial gunnery shoot at Marine Corps Base Camp Pendleton, California, Dec. 17. Marines with HMLAT-303 flew a formation flight and conducted an aerial gunnery to shoot give students the opportunity to refine basic skills needed to operate in the Fleet Marine Force.