Some USN CVSs (USS Bennington mid 1960s) had these
VSF = ASWFitRon (same same A4Gs aka VF 805 aboard HMAS Melbourne):
VSF Anti-Submarine Warfare Fighter Squadron
The VSF Story by CDR Robert R. 'Boom' Powell Part 1 - VSF-1 Anti-Submarine Warfare Fighter Squadron One ADMIN/Personnel Office
&
The VSF Story by CDR Robert R. 'Boom' Powell Part 2 - VSF-1 Anti-Submarine Warfare Fighter Squadron One ADMIN/Personnel Office
“...Once in WestPac, although Intrepid picked up a VFP-63 Photo-Crusader detachment and YF-111 provided three F-8Cs and pilots to fly photo escort, VSF-3 was considered the resident fighter squadron. The squadron color was red, Ready Room 1# (nearest the flight deck) was assigned-to be shared with the 'Sader pilots--and flight deck alerts during ship transits were stood by an A-4B with a centerline fuel tank and a pair of AIM-9 Sidewinders....”