Head: Gung Ho modified
Torso: Gung Ho modified
Arms: Barrel Roll
Waist: Gung Ho
Legs: Gung Ho

I've said it before and I'll say it again. The Gung Ho/Viper pack is the greatest two pack ever released. You get a great army builder and the best new sculpt Joe sculpted, who also turns out to be great custom fodder. Gung Ho can be used as nearly any character with very little modifications. Here all I needed to do was sculpt a messy mop of hair on the head that would allow the hat to fit, a bushy mustache, the ribbed padding on the shoulders, and attach straps, grenades and a knife, courtesy of BBI, and voila, a nearly identical new sculpt Leatherneck to the original RAH v. 1 and definitely one more the character than the Defense Mech version.