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U.S. ARMY
U.S. Army Irregular Opposing Forces Manual
March 13, 2014

TC 7-100.3

Irregular forces are armed individuals or groups who are not members of the regular armed forces, police, or other internal security forces (JP 3-24). The distinction of being armed as an individual or group can include a wide range of people who can be categorized correctly or incorrectly as irregular forces. Excluding members of regular armed forces, police, or internal security forces from being considered irregular forces may appear to add some clarity. However, such exclusion is inappropriate when a soldier of a regular armed force, policeman, or internal security force member is concurrently operating in support of insurgent, guerrilla, or criminal activities.