HSL-31

Helicopter Anti-Submarine Squadron Light 31 (HSL-31), also known as the "Arch Angels," was a U.S. Navy helicopter squadron established in 1969. Based at Naval Air Station North Island, California, HSL-31 served primarily as a Fleet Replacement Squadron, training pilots and aircrew to operate the SH-2 Seasprite helicopter for anti-submarine warfare and other naval missions. Over its years of service, the unit played a critical role in preparing crews for deployment aboard surface combatants. HSL-31 was disestablished in 1994 as part of a broader reorganization of Navy helicopter units.