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BrBZr TIL '4-F' is a classification given to someone indicating they are “not acceptable for service in the Armed Forces” for any number of reasons. It originated in the Civil War and was used to disqualify army recruits who did not have four front teeth with which to tear open gunpowder packages.
ZAwB TIL That In the American Civil War, soldiers were required to have at least four opposing front teeth so they could open a gunpowder pouch. Some draftees had their front teeth removed to avoid service.
jrJn TIL In the American Civil War, soldiers were required to have at least two opposing front teeth so they could open a gunpowder pouch. Some draftees had their front teeth removed to avoid service.