U.S. Air Force Staff Sgt. Marvin Gutierrez, 51st Medical Group optometry technician, Osan Air Base, Republic of Korea, uses a lensometer to check the prescription of a patient at Duc Pho vocational training school, Quang Ngai province, Vietnam, March 27, 2015. Operation Pacific Angel 15-3 is a total force, joint and combined humanitarian assistance operation led by the U.S. Pacific Air Forces. The operation promotes interoperability amongst U.S. military, host nation and multilateral military and civilian organizations. (U.S. Air Force photo by Staff Sgt. Tong Duong/ Released)
Senior Airman Tong Duong
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