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Part 1 of 2. A Navy lieutenant who recently returned home from the Middle East is murdered. Gibbs believes a friend of the victim, a Marine captain suffering from post-traumatic stress disorder, may be the key to finding the killer.
Conclusion. Gibbs searches for a terrorist, with the help of a Marine captain dealing with post-traumatic stress disorder. Meanwhile, Abby gets excited about the NCIS Thanksgiving dinner; and Ziva makes special plans for the opera.
A petty officer's murder produces a lead in a 40-year-old airport bombing cold case that Gibbs and DiNozzo have been assigned to for the past two years. Meanwhile, McGee gets jealous that he was not previously involved in the case.