U.S. Air Force Airman 1st Class Troy Moncrief, a 354th Civil Engineering Squadron wastewater apprentice, walks down the hall of the Eielson Air Force Base, Alaska, wastewater treatment plant July 14, 2016. Moncrief compares the underground portion of the plant to a submarine with its low hanging pipes, ladders, and tight spaces. (U.S. Air Force photo by Staff Sgt. Shawn Nickel)
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