Day 3: 1:00 A.M.-2:00 A.M. - S3-E13
Continuity mistake: When Jack leaves the cockpit he puts his gun away in a holster on his back. When he gets back to Nina and Chase he puts his gun away a second time.
Day 3: 1:00 A.M.-2:00 A.M. - S3-E13
Continuity mistake: In the scene where Alan Milliken has collapsed, his right arm is bent across his chin, while in the next shot, when Julia steps over him, his arm is above his head. (00:37:00)
Answer: According to Jack in season 5, Nina was "deep cover" before the pair ever met, so it's safe to assume she was recruited before she joined CTU. As for what her primary mission was, who knows? Perhaps it was to gather sensitive intel and pass it on to her superiors. Given that she worked for an intelligence agency, it's not a stretch. Or perhaps we may find out in season seven.
Cubs Fan ★