Potentially useful US military assets for the fight against COVID-19

Most of the US military is useless for the fight against COVID-19. However there are some bits and pieces of gear that might be useful.

US military protective suits

 The US military has a large stock of protective suits and gas masks which were intended to protect soldiers from biological and chemical weapons. Viruses have been used as biological weapons, so these suits and masks would probably provide protection against COVID-19. The suits are hot, heavy and uncomfortable to wear. They could be used to relieve the desperate shortages of protective equipment currently being experienced by hospitals.
Wikipedia article

US army field hospitals

The US army appears to have 22 combat support hospitals, which can provide up to 250 beds each. Potentially, they could provide 5500 beds. Most of these are in the reserves. They might not  be suitable for infectious disease, if the beds are located close together. They are really designed to provide surgery for battlefield injuries. Also, staffing them would require taking staff from medical facilities serving military bases and possibly Veterans hospitals. Taking military doctors from one area of the country to send them somewhere else is likely to be controversial.
Wikipedia article on Combat support hospitals

US Army Corps of Engineers

Army engineers could rapidly build temporary hospitals to provide extra bed capacity. They could also help to convert existing assets like convention centers and hotels into hospital and quarantine facilities.

US Navy hospital ships 

The US Navy has two 34 year old hospital ships, the Comfort and the Mercy. One is in port in Norfolk, and the other is in port in San Diego. Each has 1000 beds. They were designed for treating battlefield casualties, so their effectiveness for handling infectious disease patients is uncertain. Cruise ships have proven to be very bad environments for stopping the transmission of COVID-19. It is possible that these ships could not properly isolate infectious patients. The hospital ships might be suitable for providing normal medical services to the victims of heart attacks and accidents, allowing shore based hospitals to concentrate on handling COVID-19 patients. Staffing the ships could be an issue, as it would likely mean taking doctors and nurses away from existing shore based jobs.

Wikipedia article on Mercy-class_hospital_ship