Prior to modern semiautomatic magazine fed rifles and machine guns maneuvering as a cohesive unit was an effective way to focus fire/manpower on an open battlefield, distinct uniforms helped the commander sitting on a hill in the back tell what was going on so they could more quickly issue effective orders. As weapons generally became faster firing and had significantly longer effective ranges these tactics became tantamount to mass suicide, and battlefield survival shifted to focus more heavily on cover and concealment, and camouflage uniforms can help substantially with the latter.
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