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ALI BASE, Iraq -- Staff Sgt. Trevor Petersma, 407th Expeditionary Civil Engineer Squadron utilities systems craftsman, masks his face from sand as it is poured in a trench Aug. 15, 2008. In the transition from tents to trailers, the 407th ECES is rerouting the power supply along with laying water and sewage systems for latrines used by all Airmen here. Petersma is deployed from Malmstrom Air Force Base, Mont. (U.S. Air Force photo/Airman 1st Class Christopher Griffin)
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