The U.S. Army's permanent opposing forces can trace their origins to 1946, when the Army stood up the fictional 'Circle Trigonist' aggressor force based loosely on Second World War German and Soviet forces, which gradually morphed into a more Soviet type of opponent for Army exercises as the Cold War progressed. While there were no dedicated aggressor units, the Army established unique doctrine, tactics, uniforms, and even used the Esperanto language...
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History