NCIS Season 15 (2003)

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This police procedural has aired for 15 seasons, and is a spin-off of JAG. It focuses on a team from the Naval Criminal Investigative Service, who look into any criminal cases that involve personnel from the Navy or Marines. It has had a large and varied cast over the years, and has featured allies and enemies both foreign and domestic. The main character throughout the run has been Leroy Jethro Gibbs, a laconic former Marine Corps Scout Sniper.