Peterson is a Tau'ri Major in the United States Air Force. He is stationed at Homeworld Command at The Pentagon.
He escorted Colonel Everett Young to see his wife. He entered the house first in order to explain the manner in which Young was visiting. (SGU: "Darkness")
He was later assigned to Camille Wray during her visit to Earth and retrieved her when her visit was over, returning her and CMSgt. Mooney to Homeworld Command.