Opposing force

An opposing force (alternatively enemy force, abbreviated OPFOR or OpFor) is a military unit tasked with representing an enemy, usually for training purposes in war game scenarios. The related concept of aggressor squadron is used by some air forces. The United States maintains the Fort Irwin National Training Center with the 11th Armored Cavalry Regiment serving in the OPFOR role. Fort Johnson's (formerly Fort Polk) Joint Readiness Training Center (JRTC) is another major training site typically reserved for light infantry units, and the OPFOR are the 1st of the 509th Airborne Infantry Regiment. The Army's Joint Maneuver Readiness Center (JMRC, at Hohenfels, Bavaria, Germany) has the 1st of the 4th Infantry Regiment as their OPFOR. Other major units include the First United States Army which consists of 16 training brigades that often also serve as OPFOR.

This article is about a military term. For the game, see Half-Life: Opposing Force.

At a basic level, a unit might serve as an opposing force for a single scenario, differing from its 'opponents' only in the objectives it is given. However, major armies commonly maintain specialized groups trained to accurately replicate real-life enemies, to provide a more realistic experience for their training opponents. (To avoid the diplomatic ramifications of naming a real nation as a likely enemy, training scenarios often use fictionalized versions with different names but similar military characteristics to the expected real-world foes.)

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