eac's link more or less explains the "levels" of the
qualification badges.
Correct me if I'm outdated.
Airborne: the jumpmasters have yellow
backings, commandos with currency jumps wear their wings with the
red backings. Naval divers with currency jumps use blue backing
instead of red.
SOF: Ask the "crazy" fellas. :D
Marksmenship badge same size as sniper marksmanship apart from
the additional star for snipers. As for the Guards/Ranger tabs,
already coloured still need backing for what?