British Royal Air Force Air Marshal Paul Evans (left), Royal Air Force surgeon general, Col. Toby L. Rowland (center), a commander with the Joint Force Medical Group listen to U.S. 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)