Counterforce, a term that refers to a military organization or group formed to counteract or neutralize the potential threat posed by another nation or military force. Other synonyms for counterforce include opposition force, rival force, antagonist force, adversary force, and opposing force. Each of these words describes an entity that is in direct opposition to a particular force. Rivals are seen as adversaries or opponents, while opposition forces are typically the military's counterterrorism and security groups. Antagonist force describes a force that is hostile or openly opposes another, while opposing force refers to units that simulate enemy forces during military training exercises to test and improve the capabilities of friendly forces.