The entire body was an Elite Force U.S. Marine. I added the head and holster from a VvV Gung Ho figure (thanks, Gene), a .45 pistol and an M249 Squad Automatic Weapon from Marauder. The helmet needed a bit of Super Sculpey added to the inside to make it fit snugly.
If I can obtain a head for the other G.I. Joe team Marine, Leatherneck, I'll make one of him, too.