U.S. Air Force Airman Marqrell Ervin, 67th Aircraft Maintenance Unit avionics technician apprentice, shuts down the power cart being used during an operations check, Dec. 8, 2015, at Kadena Air Base, Japan. The power cart has allowed maintainers to perform necessary repairs and tests without the need to start the engines, saving the Air Force thousands of dollars each year. (U.S. Air Force photo by Airman Zackary A. Henry)
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