Port Security Unit

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U.S. Coast Guard Port Security Units are Deployable Specialized Forces organized for sustained expeditionary security and anti-terrorism. They provide Anti-Terrorism Force Protection (ATFP) missions, which include harbor and port defense, protection of High Value Assets (HVAs), expeditionary security, Sea Lines of Communications (SLOCs), special missions.^[1] and coastal surveillance.^[2][3] PSUs are expeditionary units that conduct OCONUS (Outside of Continental United States) missions in support of a requesting regional combatant commander. PSUs usually operate under the direction of the Coast Guard's Pacific Area (PACAREA) command but are unique in that they are the only Coast Guard units that can be quickly requested by the Department of Defense.

PSUs often operate and integrate with Marines and Navy Expeditionary Combat Command (NECC) elements. PSUs are also the only Coast Guard element that provide ground combat security capabilities to the Coast Guard.

PSUs were originally part of the Coast Guard's Deployable Operations Group (DOG) until it was decommissioned; PSUs are now a part of the reorganized Deployable Specialized Forces (DSF), which includes Maritime Security Response Teams (MSRTs), Maritime Safety & Security Teams (MSSTs), and Tactical Law Enforcement Teams (TACLETS).