Due to the several crossovers between them, the series is set in the same universe that JAG (1995), NCIS: Los Angeles (2009), Hawaii Five-0 (2010), NCIS: New Orleans (2014) and Scorpion (2014).
The 7th season was the first to not have a new set of opening credits at the start of the year, despite the fact the show was headed into its most successful season yet.
The sidearm carried by all of the agents is the Sig Sauer P228, a 9mm-only variant of the popular P226 semi-automatic. Adopted by the US military as the M11, it is standard issue not only for NCIS but also their Army counterpart, CID, and is also popular with Special Warfare troops for its ruggedness, reliability, and accuracy.
There is a picture of Donald P. Bellisario hanging on the "NCIS Most Wanted Wall"
Donald P. Bellisario named the character Leroy Jethro after his family. His brother's name is Leroy and his father's middle name is Jethro.
David McCallum appeared in every episode until Season 6, Episode 23, "Legend Part II". Even though he plays the medical examiner, this included shows where people weren't even murdered. In those episodes, Ducky would consult on the psychology of the case, or offer personal advice.
The show was originally entitled "Navy NCIS". They dropped the "Navy", which was redundant because the "N" in "NCIS" stands for "Naval" referring to the Navy. "NCIS" stands for "Naval Criminal Investigative Service".
Don Johnson was offered the role of Agent Gibbs. He turned it down.
Pauley Perrette, who plays Abby, actually graduated with a degree in Forensics in college, and then moved to New York to get her masters, and it was there that she got in to acting. before coming to NCIS. Producers have said that most of the personality and interests displayed by Abby come from Perrette just playing herself.
During one episode, Gibbs was trying to solve a crossword puzzle. As his character is rarely in step with pop culture, he asked DiNozzo for a TV drama with 8 letters. Tony answers St. Elsewhere (1982), which has more than 8. Mark Harmon played Dr. Bobby Caldwell on that show from 1983 - 1986.
McGee is a fan of the electronic music group "Venetian Snares". There is a small poster to the right of him on his wall.
Jethro Gibbs's father Jackson Gibbs (played by Ralph Waite ) was a World War II US Army Air Force fighter pilot, as was Mark Harmon's real life father Tom Harmon.
In 2005 Mark Harmon requested that nobody make any fuss about his September 2nd birthday. New cast member Lauren Holly had other ideas though. The frequent victim of Harmon's practical jokes, she collaborated with Michael Weatherly on a Harmon birthday extravaganza. First they ordered 150 t-shirts that read 'It's Mark Harmon's birthday', that were passed out to the entire crew. On Thursday, September 1st, she waited in her hotel room for the heads-up call from Weatherly that shooting was wrapping. At three o'clock a.m., still in her pajamas, Holly got the call, loaded up her car with party supplies and drove back to the show's sets in Santa Clarita. She and Weatherly then proceeded to cover Harmon's trailer with crepe paper, helium balloons and piñatas, then dumped large amounts of confetti everywhere. They decorated every wall, truck and trailer, then, with the cooperation of the art department, put up a picture of Harmon on all the plasma-screen displays in the squad-room set. Holly then hopped on a plane on Friday to fly back to her husband and three sons in Chicago and waited for word on Harmon's reaction. When Harmon arrived to work he saw everyone in identical t-shirts, holding signs, and assumed there was a strike. Weatherly was called by the nervous producers, who were worried what Mark would think, and who was behind it. Michael replied "I'm not going to name any names. Lauren Holly". Harmon was very touched by the gesture, which was filmed so he could take the DVD home to his wife. He did however tell Lauren with a grin, "Payback's a bitch".
Jennifer Aniston expressed interest in the role of Kate, but in order for her to accept the role, production would have had to wait for her to finish the final season of Friends.
In a scene where the team is gathered at a Friday happy hour, Ducky (David McCallum) orders a Macallan.
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