Republic P-47 ?D "JUG" 1944...
Yeah, a P47 that's gotta be it. Corsair only had six guns, P51 had four? Bombers had 12+.
If it went down late in the war, it could have been the P-47N, which was designed specifically for pacific operations, but the '42 ammo suggests to me that it was an earlier model.
What say you, USMCVet?