*As commanding officer of the SG-1 team, Colonel Jack O'Neill is assigned to defend Earth from possible hostile invasion, to explore new worlds and to gather alien technologies for study and further development. While in the Air Force, O'Neill was trained in wilderness survival, special weapons and tactics, assassination, demolition, chemical weapons, the manufacture and detonation of explosives. He resigned from service when his son Charlie died by accidentally shooting himself with O'Neill's gun. A despondent O'Neill battled with the sorrow and guilt of the loss of his son. He was recalled by his former commanding officer to go through the Stargate on the first mission precisely because of his willingness to die. Instead, the mission gave him a new desire to live.
*Source: back of card.