"Both shows have been key pillars to the CBS schedule for several years," Kelly Kahl, president of CBS Entertainment, said in a statement.
"They offer heroic stories, big stars and have attracted a passionate, loyal fan base. We're excited to have Chris, LL, Scott and these terrific casts back to bring more terrific NCIS stories to viewers in the U.S. and around the world."
"NCIS" -- the franchise's Mark Harmon-led flagship series -- was renewed two weeks ago for Season 17.
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