About NCIS Naval Criminal Investigative Service S1-19
NCIS is an American police procedural drama television series, revolving around a fictional team of Special Agents of the Major Case Response Team from the Naval Criminal Investigative Service, the primary federal law enforcement agency of the United States Department of the Navy, which investigates criminal activities involving the United States Navy and United States Marine Corps and their families. Based at the Washington Navy Yard in Washington, D.C., the NCIS team was led by Supervisory Special Agent Leroy Jethro Gibbs, a former United States Marine Corps Gunnery Sergeant Scout Sniper and a skilled investigator until late season 19.