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U.S. Air Force Brig. Gen. Barry Cornish, left, 18th Wing commander and Lt. Col. Richard Worcester, right, 718th Aircraft Maintenance Squadron commander, tack on the rank of chief master sergeant to Senior Master Sgt. Harold Frithsen, 33rd Helicopter Maintenance Unit maintenance superintendent Dec. 8, 2016, at Kadena Air Base, Japan. The rank of chief master sergeant is the highest rank possible for enlisted members in the U.S. Air Force. (U.S. Air Force photo by Senior Airman Lynette M. Rolen/Released)