Major Robert Thornbird worked at Cheyenne Mountain in the late 1960s. When SG-1 appeared in their training facility on August 4, 1969, having traveled back in time, he believed them to be Soviet spies. Before having the team sent away, he interrogated Colonel Jack O'Neill for information. Unable to reveal his identity, for fear of altering history, O'Neill told Thornbird first that he was Captain James T. Kirk and then Luke Skywalker. (SG1: "1969")

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