While at the Naval Academy, Admiral Loughlin was All-American basketball player and top-flight in tennis as well. He graduated in 1933 and served in the battleship USS New Mexico (BB-40), part of the time as an assistant to Lieutenant Hyman G. Rickover. Loughlin went to submarine school and served in various boats before taking command of the S-14 in the Panama area. He was CO in the USS Queenfish (SS-393) during four war patrols, including wolf pack operations. He was involved in the controversial sinking of the Japanese merchant ship Awa Maru in 1945. Loughlin served on various staffs, was XO of the tender Orion (AS-18), and commanded a submarine division and squadron. He as Naval Academy director of athletics and commanding officer of the oiler Mississinewa (AO-59) and cruiser Toledo (CA-133). He was plans officer on SACLant staff, Commander Submarine Flotilla Six during the buildup of the Polaris force, and Commandant Naval District Washington. In his oral history, he also discusses post-retirement service as director of Naval Academy Foundation.