The show, starringMark Harmonas Leroy Jethro Gibbs, remains one of CBS’s most popular.
However, it’s not a show where the audience can or should get too attached to its stars.
So how did Dietzen end up with such staying power?

He took risks and they paid off.
“I was a one day guest star.
And I probably wouldn’t have gotten the job.”

Dietzen has now filmed hundreds of “NCIS” episodes, he can still name his favorite.
“We did this episode called ‘Keep Going.’
It was about Jimmy Palmer out on a ledge.
“It was an absolute blast.
I got to do some wonderful scenes with some really good actors.”