Not a lot of bites, huh? I'm no expert, but I don't know of such an exclusion for a civilian. If you're military, then this explains it ...
http://www.irs.gov/pub/irs-pdf/p3.pdf
and it says it
should already be taken off your W-2.
Now go find somebody who knows what he's talking about.
(Hint: You won't find anybody here who qualifies).
If you find out differently about the subject, please post it here.