U.S. Air Force Staff Sgt. Ruth Aguon, Guam Air National Guard 254th RED HORSE Squadron, reviews concrete specifications with an American Concrete Institute instructor during a field concrete testing course in Mangilao, Guam, Dec 11, 2014. RED HORSE joined with U.S. Naval Base Guam Sailors and Department of Defense civilians to become certified in field testing concrete during a two-day course. (U.S. Air Force photo by Senior Airman Cierra Presentado/Released)
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Senior Airman Cierra PresentadoReleased
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