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)