Scott Strader, a concrete inspection manager from the Utah Department of Transportation, provides academic lessons on concrete to Airmen, U.S. Navy Sailors and Department of Defense civilians attending the field concrete testing course Dec. 11, 2014, in Mangilao, Guam. The course participants spent one day learning academics and the second in the field during the two-day course. (U.S. Air Force photo by Capt. Naseem Ghandour/Released)
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