the walking wounded

[Theseus]

Slang Dictionary
walking wounded
n. soldiers who are injured but still able to walk. (Standard English.) : Many of the walking wounded helped with the more seriously injured cases.
n. a person who is injured—mentally or physically—and still able to go about daily life. : The outpatient clinic was filled with the walking wounded.
n. stupid people in general. : Most of network programming seems to be aimed at the walking wounded of our society.

 

[nickel]

Let’s get the literal one first. I think we’ve got to try the Greek equivalent of the ‘lightly wounded’:
οι ελαφρά τραυματισμένοι
or perhaps this little grammatical monstrosity:
οι ελαφρά τραυματίες

I’m trying to inject some irony into the second meaning, but with limited success. All I could come up with was a bit of katharevousa:
τα ήσσονος σημασίας περιστατικά (injured persons of low priority, literally ‘incidents of lesser importance, minor incidents’)

For the third use, we may have to forget the sarcasm altogether and go for the jugular:
τα ζόμπι
οι νεκροζώντανοι
:)