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|Out of universe information|
McQuarrie was a member of the United States Air Force. In 1998, he was helping to transfer injured Nasyans from the Air Force Academy Hospital to Stargate Command. Cronus' Ashrak Edrekh took the uniform of TSgt. John Adams and impersonated him to complete his objective to kill Jolinar of Malkshur. When Edrekh entered the truck being driven by McQuarrie, he recognized that it was not Adams but Edrekh brainwashed him with a Hara'kesh. After driving to the SGC, he reported to the infirmary that he had no memory of the trip. (SG1: "In the Line of Duty")