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From the March 2023 State of the Coast Guard: Coast Guard Commandant to deliver her first State of the Coast Guard Address > United States Coast Guard News > Press Releases (uscg.mil)
"The U.S. Coast Guard is a unique instrument of national power. We are a military service, a law
enforcement agency, and a regulatory agency. Our combination of authorities and capabilities
means we contribute to America’s national security and economic prosperity in ways no other
single federal entity can."
The Coast Guard website expands up the definition in explaing "The Coast Guard is": About the U.S. Coast Guard (uscg.mil)
The Coast Guard employs a three-tiered system of Maritime Security (MARSEC) Levels designed to easily communicate to the Coast Guard and our maritime industry partners pre-planned scalable responses for credible threats. Full details of MARSEC is here: What is MARSEC (uscg.mil)
Force Laydown
The Coast Guard is divided into two area commands, the Atlantic Area and Pacific Area. The areas are further divided into nine district commands. The Atlantic Area includes five district commands covering the Eastern United States, the Atlantic Ocean, the Great Lakes, and the Gulf of Mexico. The Pacific area includes four district commands covering the Western United States and the Pacific Ocean.
There are eight Port Security Units (PSU) | United States Coast Guard (gocoastguard.com)