Day 6: 3:00 PM - 4:00 PM - S6-E10
Visible crew/equipment: While Bill, Nadia, and others begin watching Turner's team move toward Gredenko's presumed location on the live video feed, in the next shot facing Bill and Nadia, the T-mark quickly becomes visible at the bottom of the screen, near Bill's feet. (00:29:50)
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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