U.S. Public Health Service Rear Adm. Scott Giberson, U.S. Public Health Services acting deputy surgeon general, speaks about the role of the USPHS in responding and containing the outbreak of the Ebola virus in West Africa during an interview at Langley Air Force Base, Va., Sept. 22, 2014. The outbreak is the largest in history and the first epidemic in West Africa. (U.S. Air Force photo by Senior Airman Kayla Newman/Released)