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NCIS: Naval Criminal Investigative Service Seasons 1 - 21 offers a long - running, gripping narrative that delves into the high - stakes world of the U.S. Navy and Marine Corps' criminal investigations. Led by the stoic and experienced Leroy Jethro Gibbs, the NCIS team based in Washington D.C. tackles a diverse range of cases, from homicides and espionage to terrorism threats that jeopardize national security.