As of 2015, new episodes of the television show "NCIS" air on the CBS network on Tuesday nights at 8 p.m. Eastern Time. Reruns appear at various days and times on USA Network and on CLOO.
The acronym "NCIS" stands for Naval Criminal Investigative Service, the law enforcement agency that conducts investigations into crimes involving the U.S. Navy and Marine Corps. The television show "NCIS" takes place in Washington, D.C., and it has created two spinoff shows, "NCIS: Los Angeles" and "NCIS: New Orleans." Mark Harmon, who plays Special Agent Leroy Jethro Gibbs in "NCIS," is also an executive producer of that series and of "NCIS: New Orleans."