About this Unit
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.
Historical Facts
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Origins and Designation: Helicopter Anti-Submarine Squadron Light 31 (HSL-31) was established in 1967 at Naval Air Station North Island, California, as a Fleet Replacement Squadron (FRS) for training pilots and aircrews.
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Nickname – “Arch Angels”: The squadron was known as the “Arch Angels,” a name reflecting both their guardian role and their association with the advanced technology of their helicopters.
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Primary Mission: HSL-31 was responsible for training pilots and maintenance crews on the SH-2 Seasprite helicopter, a key anti-submarine warfare and utility helicopter for the US Navy.
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Training Thousands: Over its 22 years of operation, HSL-31 trained thousands of pilots, aircrew, and maintenance personnel, making it a vital component in the Navy’s rotary-wing community.
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First to Fly SH-2F: HSL-31 was among the first squadrons to receive and operate the SH-2F variant, which brought significant upgrades in avionics and anti-submarine warfare capability.
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Support for LAMPS: The squadron played an important role in the Light Airborne Multi-Purpose System (LAMPS) program, preparing crews to operate from small surface combatants.
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Markings and Colors: HSL-31 aircraft were recognized by their unique squadron markings, often featuring bold archangel imagery and tail codes indicating their training role.
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Community Impact: HSL-31 personnel were active in the local San Diego community, participating in public demonstrations, air shows, and educational outreach events.
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Disestablishment: The squadron was disestablished on 30 September 1988 as part of US Navy force realignments, with its training mission absorbed by other units.
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Legacy in the Fleet: Many HSL-31 alumni went on to command operational squadrons or serve in key leadership roles, ensuring the “Arch Angels” legacy lived on throughout the US Navy helicopter community.
