Wow the memories you bring back. Aside from some MOS specific changes you are spot on.
But I'm a POG so I would know only about The Wing. In the wing as aircrew we were issued three platforms if enlisted and two for the O's. An enlisted aircrew man had his rifle, and a shotgun (mossy), and all aircrew had an M9. It was always fun come range time because you would basically spend two weeks on the range. The only benefit was when you were able to get your pistol and rifle in the same week. Because you didn't have to pull pit duty.
No A3s. Only the Navy and Coast Guard maintain M16-A3s in inventory so far as I am aware. An A3 is an A2 with an A1 fire control group (safe, semi, full). In the civilian marketplace, this has somehow been confused to mean something else... usually referring to a flatop AR15 of pretty much any flavor.

