U.S. Air Force Col. (Dr.) Wayne Pritt, 633rd Medical Group commander (wearing vest), speaks to Service members arriving at the Langley Transit Center at Langley Air Force Base, Va., Nov. 13, 2014. The arriving personnel were deployed to combat Ebola in West Africa as part of Operation United Assistance, and will undergo a 21-day controlled monitoring period at the transit center before returning to their home stations. (U.S. Air Force photo by Staff Sgt. Jason J. Brown/Released)