Q: Why did Mark Harmon leave “NCIS”? I know he’s been on forever and is probably just ready to retire, but is there a specific reason? -- J.J. A: Mark Harmon’s character, Leroy Jethro Gibbs, was originally introduced on the military legal series “JAG” back in 2003 before heading up the spinoff of “NCIS.” He probably never dreamed the show […]