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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Correct me if I'm outdated.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?