The Coast Guard has dedicated Port Security Units (PSUs) that can be deployed around the U.S. or overseas, as in the Persian Gulf War. Coast Guard PSUs from Seattle, Washington; San Pedro, California; Port Clinton, Ohio; Gulfport, Mississippi and St. Petersburg, Florida were called up for active duty in the Persian Gulf between December 2002 and December 2004. Coast Guard members also jointly staff the U.S. Navy's Naval Coastal Warfare Squadrons (NCWRONs), part of the Naval Coastal Warfare command structure. Coast Guard members assigned to NCWRONs have served in the Persian Gulf, the Balkans, Korea and elsewhere around the world. Both PSUs and NCWRONs are primarily staffed by Reserve personnel.