At Ali Base, Iraq, Staff Sgt. Trevor Petersma levels sand as it is poured into a trench Aug. 15. The 407th Expeditionary Civil Engineer Squadron is rerouting the power supply, and laying water and sewage systems in the transition from base tents to trailers. Sergeant Petersma is a utilities systems craftsman with the 407th ECES. (U.S. Air Force photo/Airman 1st Class Christopher Griffin)
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