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Two crews from Crazy Horse Company, 1st Battalion, 8th Infantry Regiment, 3rd Armored Brigade Combat Team, 4th Infantry Division made armor history in September at Yuma Proving Ground, Arizona. Led by 2nd Lt. Jake Hall and Staff Sgt. Nicholas Smearman, the crews were the first to fire the XM-1147 Advanced Multi-Purpose (AMP) round, an experimental round that has been in development for over a decade.