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"In modern times, the tradition continues with the horse wearing a cavalry saddle, a sword, and a pair of boots reversed in the stirrups, signifying the warrior's last look back at his life. Blackjack served in the Caisson platoon of the 3rd U.S. infantry Regiment, known as the Old Guard, which is the Army's oldest active duty infantry regiment. It dates back to the 1700s, and he served 29 years."