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In 2268, Harris commanded the Excalibur during the disastrous M-5 Starfleet battle simulation war games. When the M-5 malfunctioned in control of the USS Enterprise, commanded by James T. Kirk, it caused the Enterprise phasers to fire full-power on the other ships that participated in the games, severely damaging the unshielded Excalibur, Harris and the Excalibur first officer died early in the conflict, and all of the ship's 400 or so crewmen were eventually lost.