Marine Counterintelligence Agents work to detect and prevent acts of terrorism, espionage, sabotage, subversion, sedition, treason and assassination. Marine Counterintelligence Agents also investigate cases of friendly personnel who may be Prisoners of War (POW), Missing In Action (MIA) or defectors. CI investigations within the Department of the Navy fall under the exclusive jurisdiction of the Naval Criminal Investigative Service (NCIS). During combat operations, the exclusive CI investigative jurisdiction held by NCIS in garrison is assigned to MAGTF commanders and is executed by Marine Counterintelligence Agents under the staff cognizance of the unit intelligence officer.