Day 6: 12:00 AM - 1:00 AM - S6-E19
Visible crew/equipment: After Tom tells the VP that he could authorize ancillary agencies to join the search to find Jack, he and Karen leave the Oval Office, and in the next shot facing Lisa as she walks toward Noah, the yellow T-mark is visible on the rug at the bottom of the screen. (00:11:05)
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.
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