U.S. Air Force Airmen assigned to the 633rd Medical Group prepare for briefings and initial evaluations upon their return from a nearly one-month deployment to West Africa, at Langley Air Force Base, Va., Oct. 20, 2014. None of the Airmen have exhibited symptoms of the Ebola Virus Disease, and all are considered to have no known exposure to the disease. (U.S. Air Force photo by Senior Airman Aubrey White/Released)