I don't believe these two squadrons flew the A-7 ... but the A-4 only. Maybe you meant some of the Corsair II drivers came over to the "light" ??? But then, since the Skyhawk was still strokin' and pulling it's weight, who needed A-7 drivers in an A-4 squadron... ????....to answer your question, VA-127 and VA-45 drew the majority of their pilots from the light (A-7E Corsair) and occasionally medium attack communities....
NAS DALLAS Adversary was almost 90% former F-4 drivers. I can't speak for NAS CECIL, but I suspect once again that A-4 drivers coming off active duty or in the A-4 RAG would be heavily represented in an A-4 Adversary program ...
Which is kinda what I experienced -- few, very few former A-7 or A-6 drivers were represented in the Adversary role .... and as the A-7 and A-6 drivers were some of the "worst" dogfighters I saw on a continuing and regular basis, they didn't do their cause much good.
They thought they were good ... and they were in air-to-mud ... they just weren't that great in air-to-air. The A-7's standard defensive move was to depart the airplane (that's about all he had ...


Plus ... the F-4 drivers didn't want 'em in there --- they wanted to save the Reserve flying seats for their "family" ... and it's understandable.