By Season 18, only 69 rules had been revealed. The secrecy surrounding the complete list adds an air of mystery, keeping fans guessing what might be hidden in Gibbs's tin. NCIS: Origins added ...

but more of Gibbs' rules were revealed until Mark Harmon exited NCIS in season 19. The list expanded into about 100 rules, ...

NCIS showrunner Don Bellisario was initially hesitant to cast Mark Harmon as Leroy Jethro Gibbs, but was eventually convinced ...

Up until NCIS: Origins Season 1 Episode 9, we all thought Gibbs was still grieving ... Tish is right up there on my list with Mary Jo. Those two are a whole vibe, and I’m pretty sure each ...