U.S. Air Force Airman 1st Class Coehn Johnson, 35th Civil Engineer Squadron Heating Ventilation and Air Conditioning journeyman, controls a cleaning instrument during summer maintenance at Misawa Air Base, Japan, May 5, 2015. This siphoning tool is used to clean out the inner coils of a chilling unit by rapidly spinning, and is controlled by a foot pedal system, allowing Johnson to advance and reverse the instrument to clean the full length of the coil from the inside. (U.S. Air Force photo by Senior Airman Patrick S. Ciccarone/Released)
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