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.
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.)
In the French Army, a FORAD (FORce ADverse, enemy force) is used to train the army, in both the centre d'entraînement au combat (CENTAC, Combat Training Center) of Mailly-le-Camp[1] and in the centre d'entraînement aux actions en zone urbaine (CENZUB, Urban Operations Training Centre).[2] Declassed AMX-30 tanks were used to simulate Soviet T-72s,[1] until 2018.[3]
There are three major training centers that utilize home-based OPFOR units for the US Army:
Various US military installations or major units have their own local versions of opposing force used for training exercises. The joint Australian–US military exercise "Crocodile '03" featured an Australian-led opposing force in which soldiers from a range of Australian units worked together with a US Marine Corps contingent.[7]
Several state defense forces have served as OPFOR units when training with the National Guard. The California State Guard,[8] the Georgia State Defense Force,[9] and the New York Guard[10] have provided OPFOR services to their respective National Guard counterparts. In 2018, the Georgia State Defense Force established the OPFOR Battalion[11] to assist National Guard Soldiers with pre-deployment training.