John Adams

From SGCommand

John Adams was a Technical Sergeant in the United States Air Force.

In 1998, John Adams was helping to transfer injured Nasyans from the Air Force Academy Hospital to Stargate Command. Cronus' Ashrak took his uniform and impersonated him to complete his objective to kill Jolinar. (SG1: "In the Line of Duty")

It can be surmised that the real John Adams was either incapacitated or killed by the Ashrak.