when was ft mcnair established?
BOOK REVIEW â On Point Magazine About Fort Lesley J McNair Established in `1791 as reservation #05 when Charles Pierre LâEnfant laid out the new Capital City, it has been defending the city of Washington DC since. It is the third oldest US Army Post in continuous operation where the Military District of Washington (MDW), National Defense University (NDU) and several of its colleges and the US Army Center of Military History (CMH) call home.