U.S. Navy Lt. j.g. Christopher Joseph, Naval Base Guam assistant production officer, tests concrete with U.S. Air Force Airman 1st Class Manuel Jimenez, 554th RED HORSE Squadron engineer assistant, during a training course Dec. 11, 2014, in Mangilao, Guam. Military members and civilians recently completed a series of two-day courses to learn concrete field testing processes and procedures. (U.S. Air Force photo by Capt. Naseem Ghandour/Released)
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