U.S. Navy Lt. John Greiner, from Camp Pendleton, Calif.,

U.S. Navy Lt. John Greiner, from Camp Pendleton, Calif., 1st Dental Battalion general dentist, and U.S. Air National Guard Lt. Col. Michael Smith 162nd Medical Group, general dentist from Tucson, Ariz., remove a broken and infected tooth from a local’s mouth during Pacific Angel 15-4, Papua New Guinea, May 31, 2015. Pacific Angel is an annual joint humanitarian assistance mission that is designed to bring humanitarian civic assistance and combined civil-military operations to the Pacific region. (U.S. Air Force photo by Staff Sgt. Marcus Morris/Released)