Final answer:
The National Capital Region (NCR) and the authorized wear of the NWU.
Step-by-step explanation:
The subject of this question is Social Studies, specifically related to the National Capital Region (NCR) in the United States.
In the NCR, the NWU (Navy Working Uniform) is authorized for wear at all locations except inside the Pentagon building, the national mall area bounded by Capitol Hill and surrounding Senate and House offices, the White House and Executive Office Building, State Department, and all federal military installations.
Constitutionally, Congress has the power to build a national capital outside the jurisdiction of any state. Washington D.C., along the Potomac River, was chosen as the national capital. Congress also has authority over all federal military installations, regardless of their location within a state.