Breaking ground
Staff Sgt. Trevor Petersma protects his face from sand as it is poured into a trench Aug. 15 at Ali Base, Iraq. In the transition from tents to trailers, the 407th Expeditionary Civil Engineer Squadron is rerouting the power supply and laying water and sewage systems. Sergeant Petersma, a utilities systems craftsman with the 407th ECES, is deployed from Malmstrom Air Force Base, Mont. (U.S. Air Force photo/Airman 1st Class Christopher Griffin)