The role of "Agent" defines "bit part." This guy introduces the soldiers to the Playboy Playmates who've arrived to entertain them at a USO show.
And that's about it. That's really all he does.
But there is one interesting factoid about him: he's played by Bill Graham, a real-life big-time concert promoter who gave some of their first concerts to The Grateful Dead, Jefferson Airplane, and Janis Joplin at his legendary Fillmore in San Francisco. The psychedelic posters from those '60s shows now sell for big bucks. Ask your grandparents if they have any.
In one of those you-can't-make-this-up occurrences, Graham died in a helicopter crash in 1991.