Batman sound effects, 4 letters
Stalag 17 residents: Abbr., 4 letters
Captured combatants, briefly, 4 letters
Champion sound effects, 4 letters
Comic strip punches, 4 letters
Geneva Convention concern, 4 letters
Hanoi Hilton occupants, 4 letters
Internment camp detainees, for short, 4 letters
Part of a treaty exchange, for short, 4 letters
Punches, comics-style, 4 letters
Some camp denizens, for short, 4 letters