Helicopter Anti Submarine Squadron Light
The "Anti-submarine Squadron (Light)" (HSL) designation was established in 1972 to designate Anti-submarine squadrons which operated the "light" SH-2 helicopter (as compared to the HS squadrons' much larger SH-3 helicopters) in detachments aboard surface force ships as a part of the "Light Airborne Multipurpose System" (LAMPS Mk I) program to provide surface ships with a helicopter to extend the ship's sensor and weapons ranges. The designation was discontinued in active use in July 2015 when the last HSL squadron was redesignated a Helicopter Maritime Strike (HSM) squadron. The designation currently exists only attached to two inactive HSL squadrons which were deactivated in 2001.
HSL designations began with HSL-30 and squadrons were numbered sequentially with even numbers assigned to Atlantic Fleet squadrons and odd numbers to Pacific Fleet squadrons (in line with the HC designation scheme but opposite of the HS numbering system). When new HSL squadrons were established to operated the new LAMPS Mk III system they were designated beginning with HSL-40 and continued the even Atlantic and odd Pacific scheme. HSL-74 and HSL-84 were redesignations of the Navy Reserve's HS-74 and HS-84 and they kept their designation numbers through the redesignation. When HSL-94 was established it was designated to fit the pattern HSL-74, 84, 94.
| HSL- Squadrons | |
| HSL-30 | 1973 - 1993 |
| HSL-31 | 1972 - 1992 |
| HSL-32 | 1973 - 1994 |
| HSL-33 | 1973 - 1994 |
| HSL-34 | 1974 - 1993 |
| HSL-35 | 1974 - 1992 |
| HSL-36 | 1975 - 1992 |
| HSL-37 | 1975 - 2013 |
| HSL-40 | 1985 - 2010 |
| HSL-41 | 1983 - 2006 |
| HSL-42 | 1984 - 2013 |
| HSL-43 | 1984 - 2012 |
| HSL-44 | 1986 - 2011 |
| HSL-45 | 1986 - 2011 |
| HSL-46 | 1988 - 2012 |
| HSL-47 | 1987 - 2009 |
| HSL-48 | 1989 - 2014 |
| HSL-49 | 1990 - 2015 |
| HSL-51 | 1991 - 2013 |
| HSL-60 | 2001 - 2015 |
| HSL-74 | 1985 - 1994 |
| HSL-84 | 1984 - 2001 |
| HSL-94 | 1985 - 2001 |
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