NCIS' Mark Harmon makes surprising confession about the series

Mark Harmon made a surprising confession about NCIS during an appearance on The View. The 72-year-old actor, known for playing Leroy Jethro Gibbs in the long-running crime drama, discussed his new book project, which is connected to NCIS. Harmon revealed that when he initially joined the show, there was very little information available about the real-life agency the show was based on. He praised Leon Carroll Jr, a retired agent who inspired his new book, and explained how they explored the true story behind the birth of NCIS.