Harris is a 1978 graduate of the United States Naval Academy at Annapolis. He was the U.S. Navy's "Old Goat" – the longest-serving Naval Academy graduate still on active duty – from January 2017 until April 2018, when he passed the title on to his classmate, Admiral Kurt W. Tidd, in a private ceremony at the Pentagon. He was also the Navy's 15th "Gray Owl" – the Naval Flight Officer on active duty who has held this designation the longest period. Harris passed the Gray Owl to Vice Admiral Herman A. Shelanski at the National Naval Aviation Museum's 2018 Naval Aviation Symposium. Governor Rick Perry designated him as an Admiral in the Texas Navy on July 18, 2006.