I excluded the Rocky and Rambo films because I assume they'd get the overwhelming majority of votes.
That leaves:
April, 1981: Nighthawks: Sgt. Deke DeSilva.
1981: Escape to Victory: Captain Robert Hatch.
1983: Staying Alive: unnamed cameo; also producer, director, and writer.
1985: Rhinestone: Nick Martinelli; also writer.
1986: Cobra: Lt. Marion Cobretti; also writer.
1987: Over the Top: Lincoln Hawk; also writer.
And at the very end of 1989:
Lock Up: Frank Leone.
Tango & Cash: Lt. Ray Tango.
That leaves:
April, 1981: Nighthawks: Sgt. Deke DeSilva.
1981: Escape to Victory: Captain Robert Hatch.
1983: Staying Alive: unnamed cameo; also producer, director, and writer.
1985: Rhinestone: Nick Martinelli; also writer.
1986: Cobra: Lt. Marion Cobretti; also writer.
1987: Over the Top: Lincoln Hawk; also writer.
And at the very end of 1989:
Lock Up: Frank Leone.
Tango & Cash: Lt. Ray Tango.