SG-3

From SGCommand

SG-3 was originally commanded by Major Castleman. (SG1: "Solitudes") The Marine combat unit is otherwise led by Colonel Makepeace, with Lieutenant Johnson and others. Apparently command had rotated initially as Majors Castleman and Warren, as well as Colonel Makepeace were shown in command for the same period of time. Teal'c was once assigned to this unit, under Major Wade. The Military unit was led by Reynolds, with Bosco and Peterson.

The teams SG-3, SG-12 and SG-15 are called in by General George S. Hammond when SG-1 are negotiating with what seems to be a hostile human race, called the Aschen. (SG1: 2001") During an exercise with four young SGC recruits in March 2002, SG-3 returns from an away mission through the Stargate. (SG1: "Proving Ground") Later, the same month, Major Lawrence is the team leader and the team is sent in to help the Latonans and SG-9 against attacking Jaffa on Latona. (SG1: "The Sentinel")

SG-3 is constantly mentioned by Jack O'Neill, suggesting that he is trusting its members to function as SG-1's backup and covering unit. SG-3 was standing by if needed in Alpha Site Tok'ra/Jaffa crisis in August 2002, but their help was never needed (SG1: "Allegiance") and they were back-up, at Jack O'Neill's request, when SG-1 and SG-4 went after Nirrti on planet 367 (SG1: "Metamorphosis"). They were sent in as reinforcements together with SG-10 when securing P4S-237 when Mot had been defeated (SG1: "Prophecy") and they were securing the Stargate when O'Neill and Teal'c was under attack for the first time by a Kull warrior. (SG1: "Evolution, Part 1") They are experts in securing the gate when there an increased risk of attack, because of their experience in those matters. (SG1: "Death Knell," "Heroes, Part 1", "Lost City, Part 1")

While it is unknown who immediately replaced Makepeace as the commander of SG-3, eventually this position was assigned to Reynolds, most likely after he was promoted to full Colonel. (SG1: "Fallen")