To extend to the Mayor of the District of Columbia the same authority with respect to the National Guard of the District of Columbia as the Governors of the several States exercise with respect to the National Guard of those States.

Amends the District of Columbia Code to make the Mayor of the District of Columbia (currently, the President of the United States) the Commander-in-Chief of the militia of the District.

Makes conforming amendments to comply with this Act to: (1) Title 10 (Armed Forces); (2) Title 32 (National Guard); (3) the National Defense Authorization Act for Fiscal Year 1993; and (4) the District of Columbia Home Rule Act.