Jack Bauer: I used to be in the military. Used to do field work for the CIA. I've been to some horrible places. I've seen some pretty terrible things. I don't think I've ever been this scared in my whole life.
Jack Bauer: I've killed two people since midnight. I haven't slept in over 24 hours. So maybe you should be a little more afraid of me than you are now.
10:00 P.M.-11:00 P.M. - S1-E23
Sherry Palmer: You've got to be kidding.
Jack Bauer: I've never been more serious in my life.
Nina Myres: How did Jack sound?
George Mason: Alive.
Mason: Have you noticed, wherever you go there's a body count?
Mrs Palmer: They haven't told you? There has been an assassination threat.
David Palmer: Is that all? I thought it was something serious.
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 ★