NCIS is a predominantly civilian agency, with civilian leadership reporting directly to the Secretary of the Navy.

This arrangement -- unique in America's military community -- provides both a close relationship with the uniformed naval services and a valuable objectivity. NCIS provides vital investigative and operational support to the Navy and Marine Corps every day, carrying out its responsibilities under the authority of the Secretary of the Navy.

Mark D. Clookie became the fourth civilian Director of the Naval Criminal Investigative Service (NCIS) on February 14, 2010, following his appointment to the position by the Honorable Ray Mabus, Secretary of the Navy.