Military mind game, for short

PSYOP

This tactic often involves leaflets or broadcasts to influence enemy morale rather than direct combat. Think of the "O" as standing for "operations."

"Military mind game" hints at psychological operations, where forces use tactics to influence enemy behavior or morale. "For short" signals the answer is an abbreviation, and "PSYOP" is the standard military shorthand for psychological operations. The clue plays on the idea of a "game" to suggest strategy and deception, which fits the nature of these operations.