Combat!: The Bankroll (1966) (TV)

Kirby plays poker with money borrowed from fellow G.I. Jeetleman. The big winner up until then has been G.I. Farley. Kirby consistently wins until Farley, claiming to have run out of money, starts giving him I.O.U.s (or markers, as they call it in the episode). They have to stop playing because they are called into combat. They raid a nearby village which is infested with Germans. Farley tries to turn Kirby into his protector, since, he says, if he dies he won't be able to pay him what he owes.