U.S. Service members enter the cordoned-off Joint Base Langley-Eustis’ Langley Transit Center, Va., Nov. 13, 2014. Ninety Service members, who returned from missions combating the Ebola Virus Disease in West Africa, are staying at the center for 21 days of controlled monitoring. The 21-day monitoring period was established by the Secretary of Defense, and during this period, Service members will be separated from their families and the general public. (U.S. Air Force photo by Staff Sgt. Natasha Stannard/Released)