The second wave of G.I. Joe action figures hit in 1983. The first "straight arm" figures debuted in 1982 and were updated with "swivel arm battle grip" in 1983 but a new wave of figures hit the stores later that year and Gung-Ho, the G.I. Joe United States Marine Corps representative was among them.
As as kid, I thought this figure was amazing. As an adult, I realize he is rather ludicrous. A big old mustache, no shirt, giant Marine Corp insignia tattoo on his chest, and a grenade launcher as a weapon. Everything about this action figure screamed overkill. Not to mention his questionable aqua-blue camos. I'm not sure in what environment that would be appropriate.
Still, as a kid, in my imagination, many Cobra troopers were blown to smithereens by that grenade launcher.