Jonathan J. O'Neill, also known as John or, most commonly, Jack, is a Lieutenant General, in the United States Air Force, who served seven years in the Stargate Program, formerly as a Colonel and also as the leader of Stargate Command's main team, SG-1.
After being released from stasis a few months after the Battle of Antarctica, O'Neill was promoted to Brigadier General and became the new Commanding officer of the SGC, replacing Lt. General George S. Hammond. O'Neill led the SGC for a year before also being replaced by Major General Henry Landry with O'Neill being promoted to Major General and reassigned to The Pentagon to become head of Homeworld Security. He reappeared again, having been promoted to the rank of Lieutenant General.
