190823-N-BN978-031 GREAT LAKES, Ill. (Aug. 23, 2019) Chief Machinery Repairman Brian Barr, leading chief petty officer of Surface Warfare Officer School Unit (SWOSU) Great Lakes' MR A School, goes over the phases students go through to complete their school during a tour with Navy Personnel Command engineering detailers, Aug. 23. (U.S. Navy photo by Brian Walsh/Released)