Jack O'Neill

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Jonathan J. O'Neill, also known as John or, most commonly, Jack, was a Lt. General, in the United States Air Force, who served eight years in the Stargate Program until he was transferred to The Pentagon to become the head of Homeworld Command (also called Homeworld Security). He was the original leader of SG-1 and later became the commander of Stargate Command. Master Bra'tac has called him "O'Neill of Minnesota."