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‘NCIS’: When Does the Season 18 Finale Air?

‘NCIS’ has put fans through a lot this season. From the loss of Maria Bello’s Jack Sloane to Mark Harmon’s character Agent Leroy Jethro Gibbs being suspended indefinitely. And, based on a cryptic post from Wilmer Valderrama, the losses may not be over yet. So, when does the season 18 finale air?