Coast Guard Counterintelligence Service (CGCIS) - CGCIS preserves the operational integrity of the Coast Guard by shielding its operations, personnel, systems, facilities and information from Foreign Intelligence and Security Services (FISS), and the intelligence efforts of terrorist organizations, drug trafficking elements and other organized crime groups, and adversaries, and insider threats. CGCIS supports the identification, understanding, neutralization, and exploitation of the operations of FISS and of non-state actors who employ intelligence tradecraft. CGCIS manages the Foreign Visitor Program, providing tailored foreign intelligence threat and awareness briefings specific to foreigners visiting Coast Guard commands. CGCIS also conducts foreign travel briefs and debriefs, providing tailored foreign intelligence threat and awareness briefings on FISS, terrorism, and criminal threats, and health concerns to educate Coast Guard personnel traveling to high-threat countries.
(From https://www.uscg.mil/doctrine/CGPub/CG_Pub_2_0.pdf)