"Need to Know" is the 17th episode of the ninth season of the American police procedural drama NCIS, and the 203rd episode overall. It originally aired on CBS in the United States on February 28, 2012. The episode is written by George Schenck & Frank Cardea and directed by Michelle MacLaren, and was seen by 18.20 million viewers.In the episode, a Chief Petty Officer is murdered right before Gibbs' eyes when he is about to reveal information connected to an international arms dealer.