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Reference.org
Opposing force
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<p>An opposing force (alternatively enemy force, abbreviated OPFOR or OpFor) is a <a href="/facts/Military_unit/M93qdLz7">military unit</a> tasked with representing an enemy, usually for training purposes in <a href="/facts/War_exercise/xeqxTBut">war game</a> scenarios. The related concept of <a href="/facts/Aggressor_squadron/Qj4g8M4F">aggressor squadron</a> is used by some air forces. </p><p>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.) </p>