Major Harper has served as the commanding officer of SG-5. During the mission to locate the repository of the Ancients on P3X-439, Harper and SG-5 joined Colonel Reynolds and SG-3 in providing backup for SG-1. Together they held the gate against Anubis's attack until SG-1's return. Major Harper was also involved in the search for Vala on Earth after she was abducted by Athena.
Portrayed by: Jason Howell
Cross Reference: Colonel Reynolds, SG Teams
Episode Reference: Lost City