4-F

[ fawr-ef, fohr- ]
/ ˈfɔrˈɛf, ˈfoʊr- /

noun

a U.S. Selective Service classification designating a person considered physically, psychologically, or morally unfit for military duty.
a person so classified.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019