A coal-black Morgan-American Quarter Horse cross, Black Jack served in the Caisson Platoon of the 3rd U.S. Infantry Regiment (The Old Guard). Named in honor of General of the Armies John J. "Black Jack" Pershing, he was the riderless horse in more than 1,000 Armed Forces Full Honors Funerals (AFFHF), the majority of which were in Arlington National Cemetery. With boots reversed in the stirrups, he was a symbol of a fallen leader.