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Probably DC National Guard units on the March on Washington March in August 1963. That when the US Army National Guard knew how to do riot control. Note the bayonets being mounted and tear gas grenades on the pistol belts.
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The United States Army Military District of Washington (MDW) is one of nineteen major commands of the United States Army. Its headquarters are located at Fort Lesley J. McNair in Washington, D.C. The missions of the units in the Military District of Washington include ceremonial tasks as well as a combat role in the defense of the National Capital Region.