Who oversees the Air National Guard units in the District of Columbia?

The correct answer is that the U.S. President oversees the Air National Guard units in the District of Columbia. This is due to the unique status of the District of Columbia; it does not have a governor like the states do. Instead, the President has the authority to direct and control the National Guard units in D.C. This oversight includes the ability to activate and deploy these units, especially in response to federal requirements or emergencies.

The Air National Guard in the District of Columbia operates under the legal framework allowing the President to oversee these units, reflecting the federal government's jurisdiction in this area. This setup is integral for ensuring a coordinated response in national defense-related matters, particularly given that the District houses significant federal government institutions.

Understanding this relationship is crucial for recognizing how military command structures operate, especially in a federal district devoid of state governance.