Unlikely, very, that any military facility in the DC immediate area will close. How else would the region sustain such a bright, robust economic outlook for the politicians?
Down here, we constantly worry about Macdill AFB. Home to most Special Operations commands, refueling wing, and literally 100's of thousands of active and retired military (most retired) personnel that utilize the base and its facilities.
MacDill Air Force Base - Wikipedia, the free encyclopedia
"The host unit at MacDill AFB is the 6th Air Mobility Wing (6 AMW), assigned to the Air Mobility Command's 21st Expeditionary Mobility Task Force. In addition to operating KC-135R Stratotanker and C-37A Gulfstream aircraft, the 6 AMW provides day-to-day mission support to more than 3,000 personnel in its immediate command, along with more than 50 Mission Partners comprising over 12,000 additional personnel, to include the United States Central Command (USCENTCOM), United States Special Operations Command (USSOCOM), and a detachment of United States Africa Command (AFRICOM). It is a force capable of rapidly projecting air refueling power anywhere in the world. MacDill also bases the Aircraft Operations Center of the National Oceanic and Atmospheric Administration, whose NOAA Corps flies "Hurricane Hunter" missions in WP-3D Orion and Gulfstream IV aircraft."
Seven of nation’s 10 most affluent counties are in Washington region - The Washington Post
DC is essentially immune. Just have to keep all those wealthiest counties in the area, if not in the US, happy. Not so much anywhere else.