Leatherneck is a G.I. Joe team operative in the A Real American Hero line. First released as a Hasbro carded action figure in 1986, with 3 distinct figure versions produced across the 1982 to 1994 vintage run.
Leatherneck appears in 4 episode synopses across the Sunbow (1983 to 1987) and DiC (1989 to 1992) runs, first appearing in Sunbow's "Let's Play Soldier" (1986). Full screencap and continuity review pending.