John Michaels was a Colonel in the United States Air Force. He was the commanding officer of Jack O'Neill's squad when he was a Captain. On a mission to East Germany in 1982 to extract a Russian spy named Boris, he was killed. Before his death, he asked O'Neill to look after his wife Barbara Michaels. It was this mission that The Keeper made O'Neill relive when he was hooked into the Virtual reality pod. (SG1: "The Gamekeeper")

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