<unk> " (American English) or "Blighty<unk> " (British English) is military slang for a type of<unk>  received in combat which is serious enough to get the soldier sent away from the fighting, but neither fatal nor permanently crippling.
Million-dollar wound
Sharps waste
Alternate care site
Trauma shears
Straw 
Stab wound
Stripper 
Powder