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In relation to US Army I see year 1921... ->
https://military.wikia.org/wiki/United_States_Army_Military_District_of_Washington
United States Army Military District of Washington | Military Wiki | Fandom
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...
https://military.wikia.org/wiki/United_States_Army_Military_District_of_Washington