Timothy McGee uses the pseudonym Thom E Gemcity for his novel 'Deep Six'. Thom E Gemcity is an anagram for Timothy McGee.
Gibbs was a Gulf War veteran, but the tee-shirt he occasionally wears could be a reminder of his NIS origins. Although the NIS was renamed in 1985, becoming the NSIC, then the NISC, it was only in 1992 the NCIS was taken out of the uniformed navy's control and a civilian director appointed.
Often times in the monitors behind Denozo's desk Frontrunner and Trax trains from UTA in Salt Lake City UT can be seen in a loop.
Mark Harmon received a call during the summer between seasons 3 and 4 telling him to stop shaving - because Gibbs was to have a more gruff look, along with a mustache.
The team frequently issues BOLOs for people - this stands for 'Be On Look Out'
David McCallum plays Donald Mallard. Mallard is a breed of duck, hence his nickname Ducky. His name could also be construed to be Donald Duck.
Whenever we see flashbacks featuring young Gibbs, the younger version is played by Mark Harmon's son, Sean.
Donald P. Bellisario confirmed that before Sasha Alexander decided to leave the show, his plan for Season 3 was to build on the Tony/Kate relationship, and the ideas for the episodes "Under Covers" and "Boxed In" (which had large emphasis on the Tony/Ziva relationship) were both ideas conceived with the intention of forcing the characters to confront their emotional attachments to the other.
Michael Weatherly's character's father is played by Robert Wagner. Prior to doing NCIS Weatherly actually played Robert Wagner in a TV movie The Mystery of Natalie Wood (2004) about Wagner's wife.
Sean Murray (Special Agent Timothy McGee) is the step son of Donald P. Bellisario, and his sister on the show is in fact his step sister in real life.
Many of the character's histories are taken from the actor's real lives. For instance, Michael Weatherly's father has a large fortune from a family business, as does Tony's father (and Weatherly's Dark Angel character). Abby Scuito states she used to go through old cars to see what happened to them and try to find out what went wrong, and Pauley Perrette did this in her childhood.
NCIS is the only military investigative service comprised entirely of civilian investigators. Special Agents of Army CID and Airforce Office of Special Investigations are active duty military personnel. Coast Guard Invesigative Service Special Agents are a mix of active duty personnel and civilian investigators. (CGIS)
Mark Harmon, Rocky Carroll, and Lauren Holly all appeared together on Chicago Hope.
Mark Harmon, who was born in 1951, would be old enough to be a Vietnam era veteran, but his character of Gibbs stated that he was a Gulf War veteran as he was too young to be a Vietnam vet, so Gibbs is much younger than Harmon.
During the opening credits there is a note about what NCIS represents and it reads: The Naval Criminal Investigative Service (NCIS) is a worldwide federal law enforcement organization whose mission is to protect and serve the Navy and Marine Corps and their families.
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