The Marine barracks gym remains open despite an order from Washington D.C. Mayor Muriel Bowser to close gyms across the city to help stymie the spread of the virus. The governors of Maryland and Virginia have also ordered the closure of gyms across the two states.

Department officials in an emergency planning document said medical centers should be prepared for waves of illnesses over the next 18 months.

More than 300 service members have tested positive for COVID-19, while 10 percent have recovered.