VF154,
How are the "Black Knights" as they transition to the Super Hornet?
I did a search and from what I see no one makes decals for VMA-322 A-4Ms. You may have to "canny" from a few similar decal sheets to produce your "Fighting Gamecock" Skyhawk (I'll have to do the same thing for my 1/48 CH-46E). I found a few pics online and for their low-vis scheme it wouldn't be to difficult. Their tailcode is "QR". The link below might help.
http://www.a4skyhawk.org/5E/G159470/159490.jpg
Semper Fi!