Leroy Jethro Gibbs’ Rules Leroy Jethro Gibbs is a fictitious character on the TV show NCIS (Naval Criminal Investigative Service). Mark Harmon plays special NCIS Agent Gibbs. Mark Harmon, plays a tough by-the-books NCIS agent who was a former active-duty, U.S. Marine. Gibbs has many rules that he lives by and I can relate to… Continue reading Leroy Jethro Gibbs’ Rules