Duffel bags and suitcases sit outside the Langley Transit Center at Langley Air Force Base, Va., Dec. 4, 2014. Several Service members from multiple branches of the U.S. military underwent a 21-day controlled monitoring period at the transit center after returning from West Africa in support of Operation United Assistance. (U.S. Air Force photo by Airman 1st Class Breonna Veal/ Released)

A U.S. Service member runs to a bus after staying at from the Langley Transit Center at Langley Air Force Base, Va., Dec. 4, 2014. All military personnel returning to the U.S. from Ebola-Virus Disease missions in West Africa were directed by the Secretary of Defense and the Chairman of the Joint Chief of Staff to undergo a 21-day controlled monitoring program. (U.S. Air Force photo by Airman 1st Class Breonna Veal/ Released)

A U.S. Service member packs his luggage in the bus after leaving the Langley Transit Center at Langley Air Force Base, Va., Dec. 4, 2014. The 633rd Air Base Wing established the center as a controlled monitoring area to house members returning from Operation United Assistance missions in West Africa. (U.S. Air Force photo by Airman 1st Class Breonna Veal/ Released)

U.S. Air Force Chief Master Sgt. Trae King, 633rd Air Base Wing command chief, ensures U.S. Service members leave safely after being released from the Langley Transit Center at Langley Air Force Base, Va., Dec. 4, 2014. Joint Base Langley-Eustis built the transit center in less than one week to accommodate the U.S. service members who would be spending a 21-day controlled monitoring period there. (U.S. Air Force photo by Airman 1st Class Breonna Veal/ Released)

U.S. Service members embrace as they say goodbye to each other outside the Langley Transit Center at Langley Air Force Base, Va., Dec. 4, 2014. While at the LTC, Service members had access to a cafeteria, and entertainment, recreation, and fitness centers. (U.S. Air Force photo by Airman 1st Class Breonna Veal/ Released)

U.S. Service members disembark from the Langley Transit Center to a bus at Langley Air Force Base, Va., Dec. 4, 2014. The Langley Transit Center provided accommodations and routine medical check-ups – including twice-daily temperature checks – for the returning members during the controlled monitoring period. (U.S. Air Force photo by Airman 1st Class Breonna Veal/ Released)