Lt. Morrison was one of the team members of SG-3. When General Hammond temporarily retired, General Bauer took over command of the SGC. He reassigned some personnel, including making Teal'c one of Morrison's teammates under Major Waite.
Bauer was determined to get some refined naquadah, so he ordered SG-3 to P3S-452, a Goa'uld stronghold, to retrieve some of the element. The team was able to retrieve some naquadah, but at a heavy price. Major Waite was killed during the mission. Lt. Morrison provided cover fire for his team, and was seriously injured during the heavy battle. Teal'c carried Morrison through the Stargate back home. Whether or not Morrison survived his injuries and/or his current status, is unknown.
--Aurora 17:14, 31 May 2006 (PDT)