forces have served as OPFOR units when training with the National Guard. The California State Military Reserve, the Georgia State Defense Force, and the New York Guard have provided OPFOR services to their respective National Guard counterparts. In 2018, the Georgia State Defense Force established the OPFOR Battalion to assist National Guard Soldiers with pre-deployment training. Ranks Officer ranks Other ranks </noinclude> </noinclude> Gallery Notes References Further reading Validating the "Enemy" (discusses the United States Army OPFOR units and post-Cold War changes to OPFOR.) The Circle Trigonists (Aggressors), a summary of the opposing force Aggressor used by the United States Army from ca. 1946–1978 Military education and training