Sito Jaxa was a 24th century Bajoran and Starfleet ensign who was believed to have been killed in the line of duty in 2370 while on a secret mission as a member of the USS Enterprise-D crew.
While in Starfleet Academy in 2368, Sito Jaxa was a member of Nova Squadron along with Wesley Crusher. Under the direction of Cadet Nicholas Locarno, Nova Squadron attempted the dangerous Kolvoord Starburst maneuver during a flight exercise – an action that resulted in a collision and death of fellow cadet Joshua Albert. Sito and her fellow cadets lied about their flying of the illegal maneuver to a board of inquiry led by Rear Admiral Brand and Captain Satelk. When the crew of the Enterprise-D discovered inconsistencies in the report, Captain Jean-Luc Picard reprimanded Cadet Crusher and threatened to go to the board of inquiry himself, but Crusher eventually decided to reveal the true cause of the accident. Locarno was expelled from the Academy, while Sito and the other cadets had their academic credits from the past year canceled. Sito remained at Starfleet Academy, despite the stigma attached to the cadets involved in the cover up. Sito had to take her flight test with the instructor because no other cadet wanted to be her partner.
After graduating the Academy, Sito was assigned to the Enterprise-D at the request of Captain Picard because he wanted to make sure she had a fair chance to redeem herself, although she did not realize that at the time. Sito worked in the security department under Lieutenant Worf, and developed close friendships with fellow junior officers Sam Lavelle, Nurse Alyssa Ogawa, Taurik, and Ten Forward waiter Ben. Sito found a mentor in Worf, who suggested her for promotion to the night duty operations officer position, in competition with Sam Lavelle. She was also a student in his mok'bara class.