Mark's final scenes as Gibbs were real tear-jerkers! 😢

Mark Harmon left a mark in 'SNL' history when he hosted the show shirtless in 1987. 👕

The cast of 'NCIS' shares some very personal behind-the-scenes secrets! 😲

Mark Harmon was a football star at the UCLA. 🏈

Only super fans will notice desk decor matches the 'NCIS' characters! ☑️

Mark's favorite memory of 'NCIS'? Cast dinners! 🍲