U.S. Navy Lt. Matthew R. Guggenbiller (left), a flight surgeon with Marine Medium Tiltrotor Squadron 264, shakes hands with Air Force Lt. Gen. Thomas W. Travis, surgeon general of the Air Force, during a Surgeons Generals' visit at Camp Bastion, Helmand province, Afghanistan, April 18, 2013. The generals visited to view the medical evacuation platforms available to Regional Command (Southwest). (U.S. Marine Corps photo by Cpl. Ashley E. Santy/Released)