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U.S. Air Force Chief Master Sgt. Matthew Grengs, 455th Air Expeditionary Wing command chief, gives a speech during the Prisoners Of War, Missing In Action Remembrance and Retreat Ceremony at Bagram Airfield, Afghanistan, Sept. 17, 2015. The ceremony was in honor of National POW/MIA Remembrance Day, which is observed annually in the United States on the third Friday of September. (U.S. Air Force photo by Tech. Sgt. Joseph Swafford/Released)
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