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Military and law enforcement\n\n Blackjack (weapon), a type of baton for law enforcement. RQ-21 Blackjack, a small tactical unmanned air system. Black Jack Brigade, nickname of the U.S. 2nd Brigade Combat Team, 1st Cavalry Division.

It first appeared in France around 1650, was popular in English card clubs in the early 19th century, and is still played in some French casinos. It never became popular elsewhere, though, and is diminishing in France, probably because of its low house percentage, in that the bank's only certain win is a 31-point tie.