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• Leroy Jethro Gibbs (Mark Harmon) is the Supervisory Special Agent of the Major Case Response Team (MCRT). He was previously a sniper in the United States Marine Corps, achieving the rank of Gunnery Sergeant, until 1991 when his first wife Shannon and daughter Kelly were killed by a Mexican drug dealer.[14] Gibbs later killed the drug dealer in Mexico, after being told by Special Agent Mike Franks where to find him, and joined NIS, later renamed NCIS, initially training under Franks.[15] After Franks' retirement, Gibbs became the agent in charge of the MCRT. He has been married four times, but is currently single, which is often referred to on the show. He also has a difficult relationship with his father. Gibbs and Director Jenny Shepard had a romantic relationship in the past, shown through the use of flashbacks, and he has had several romantic relationships with various recurring female characters throughout the show. He is seen as somewhat of a fatherly figure to Abby, Kate, and later to Ziva. Due to his senior status at NCIS, he has also carried out tasks at a higher level, such as becoming a temporary acting director for the entire agency and point man for the agency during a major crisis such as the Harper Dearing terrorist attacks.