Lt. Gen. Thomas Travis, surgeon general, U.S. Air Force, right, greets service members at Craig Joint Theater Hospital during a tour of the airfield’s medical facilities on Bagram Airfield in Parwan province, Afghanistan, April 17, 2013. The surgeons general of the Army, Navy, Air Force and the United Kingdom got a overview of Bagram Air Field's medical capabilities during a tour of the base. (U.S. Army National Guard photo by Spc. Mark VanGerpen/Released)