Offensive counterintelligence operation refers to a clandestine counterintelligence activity, conducted for military, strategic, Department of Defense, or national counterintelligence and security purposes against a target having suspected or known affiliation with foreign intelligence entities, international terrorism, or other foreign persons or organizations, to counter terrorism, espionage, or other clandestine intelligence activities that threaten the security of the Department or the United States. The two types of offensive counterintelligence operations are double agent operation and controlled source operation. Also called OFCO.