Coast guard
It is within the government portfolio of the Ministry of National Security. The Commanding Officer of the Coast Guard reports to the Chief of Defence Staff. The TTCG is responsible surveillance, search and rescue, fisheries enforcement, pollution enforcement, and counter-narcotics operations for maritime jurisdiction of Trinidad and Tobago.

Turkey: The Turkish Coast Guard of the Republic of Turkey (Turkish: Sahil Güvenlik Komutanlığı) is a branch of the Turkish Armed Forces and was initially founded in 1859. During peacetime, it is under the command of the Ministry of Interior. However, during war or emergency time, it falls under the command of the Turkish Navy. On July 13, 1982, it was assigned to the Turkish Gendarmerie becoming both a military and a law enforcement service. Finally, the organization obtained its current form on January 1, 1985.
The Coast Guard is responsible for enforcement of Turkish maritime law and controlling of the Republic of Turkey's coasts in the responsibility area. It is also the main search and rescue coordination authority for the Turkish coastal zone. The Coast Guard consists of four area commands, as the Black Sea, the Sea of Marmara and adjacent straits, the Aegean Sea, and the Mediterranean Sea.
The Turkish Coast Guard maintains a fleet of coastal patrol ships and small craft, as well as helicopters and fixed-wing aircraft.

Ukraine: Ukrainian Sea Guard is the coast guard service of Ukraine, subordinated to its Border Guard Service, the local successor of the Soviet Border Troops Naval Units that have been similarly responsible for coast guard tasks. However, there were some interchanges in units, ships and personnel between Sea Guard and the Ukrainian Navy. Operates four sea guard detachment; a sea guard cutters division in Mariupol; a special-purpose sea guard cutters division in Yalta; and a riverine Dnieper sea guard cutters division in Kyiv. Sea guard administration is split between the Azov-Black seas regional administration in Simferopol and the Southern regional administration in Odesa.
Service persons of the Sea Guard wear either the black uniform similar to Ukrainian Navy, but decorated with some green elements (traditional for border guard), or a common uniform of the Border Guard.

United Kingdom: In the United Kingdom, His Majesty's Coastguard fulfill six of the nine functions required by the IMO; Search and Rescue, Pollution Response, Vessel Traffic Management, Maritime Safety, Accident and Disaster Response, and Maritime Security. The other three IMO functions; Customs/Border Control, Fisheries Control and Law Enforcement, are undertaken by the UK Border Force, Environment Agency and local police forces, respectively. The maintenance of seamarks is the responsibility of Trinity House (in England and Wales), the Northern Lighthouse Board (in Scotland) and the Commissioners of Irish Lights (in Northern Ireland). HM Coastguard is a civilian agency - as the duties traditionally associated with a military coast guard service are spread around the Civil Service and British Armed Forces, unlike other coast guard services around the world. It is a Category 1 emergency responder alongside the United Kingdom's regional police, fire, and ambulance services.
Lifeboat services are provided by the Royal National Lifeboat Institution, or other independent lifeboat stations not affiliated with the RNLI, all under the coordination of the Coastguard. HM Coastguard wet leases commercial helicopters — Sikorsky S-92s and AgustaWestland AW189s — to provide aerial search and rescue cover around Great Britain and Northern Ireland, as well as the United Kingdom's emergency towing vessel fleet in areas not served by tug brokers. On the coastline, HM Coastguard maintains a network of cliff and mud rescue teams, comprising around 4,000 volunteers, and can call upon the National Coastwatch Institution which mans many former Coastguard lookout stations around the coast. It is part of the Maritime and Coastguard Agency, which in itself is an executive agency of the Department for Transport.

Scotland: The Scottish Fisheries Protection Agency (SFPA) is responsible for both deterring illegal fishing in Scottish waters, as well as monitoring the compliance of the fisheries industry in Scotland with the relevant Scottish and European Union laws on fisheries.

British Overseas Territories: Royal Bermuda Regiment
The Bermuda Regiment Coast Guard is responsible for Maritime Law Enforcement and Search & Rescue in Bermudian Territorial waters. BRCG works in partnership with the Bermuda Police Service.
Cayman Islands Coast Guard
The Cayman Islands Coast Guard is responsible for Maritime Law Enforcement and Search & Rescue in Caymanian Territorial waters. CICG works in partnership with Royal Cayman Islands Police Service, Cayman Islands Regiment, Cayman Islands Customs & Border Control, and Cayman Islands Immigration Service.

United States: Formed in 1915 by the merger of the United States Revenue Cutter Service (established as the United States Revenue-Marine in 1790 and renamed in 1894) and the United States Life-Saving Service (established in 1848), and later absorbing the United States Lighthouse Service in 1939 and the functions of the Bureau of Marine Inspection and Navigation in 1942 and 1946, the United States Coast Guard (USCG) is a military service, a law enforcement agency, and regulatory agency. It is one of the eight uniformed services of the United States and one of the six services of the United States Armed Forces. Its role includes enforcement of U.S. maritime law, coastal defense, search and rescue, environmental protection, aids to navigation, and regulation of maritime industries.
During peacetime the USCG falls under the administration of the United States Department of Homeland Security (previously the U.S. Department of Transportation, 1967–2003, and the United States Department of the Treasury, 1915–1967). During wartime, the USCG may, at the direction of the President of the United States, report to the Secretary of the Navy; its resources, however, are integrated into U.S. military operations in wartime (see 14 U.S.C. §§ 3–4).
As of 2022, the Coast Guard had  40,757 Coast Guardsmen on active duty, 6,240 reservists, approximately 26,000 auxiliarists, and over 7,100 full-time civilian employees. The Coast Guard maintains an extensive fleet of 243 coastal and ocean-going patrol ships, tenders, tugs and icebreakers called "Cutters", and 1650 smaller boats, as well as an extensive aviation division consisting of 201 helicopters and fixed-wing aircraft. While the U.S. Coast Guard is next to the smallest of the U.S. armed service branches, in terms of size, the U.S. Coast Guard is the world's largest coast guard.
USCG helicopters are equipped with hoists to rescue survivors and also play a major role in law enforcement. The helicopters are able to land and take off from USCG cutters, making them an indispensable tool in fighting illegal drug traffic and the influx of undocumented immigrants attempting to illegally enter the country. The fixed-wing aircraft are used for long range search and rescue and law enforcement patrols. A construction and repair shipyard has been maintained since 1899 in the Baltimore Harbor area at Curtis Bay, United States Coast Guard Yard at Curtis Bay, Maryland
Today's lighthouses on the American coasts are all maintained by the U.S. Coast Guard, from the previous old U.S. Lighthouse Service. The list of active light houses, lighted beacons, etc. that provide detailed information on aids to navigation with their locations and characteristic signals is currently maintained by the U.S. Coast Guard in its Light List issued each year.
The USCG has a small service academy, equivalent to both the United States Military Academy and the United States Naval Academy in terms of students earning a 4-year degree and commission upon graduation. The United States Coast Guard Academy is much smaller in size (approx. 1,000 students) and is located at New London, Connecticut. All enlisted Coast Guardsmen attend boot camp at Cape May, New Jersey.
Several other federal, state and local agencies operate maritime police and security units with law enforcement and search and rescue functions similar to the Coast Guard. Examples include the New Hampshire Marine Patrol and the U.S. Customs and Border Protection, Air and Marine Operations, along with state Naval Militia.

Uruguay: In the Republic of Uruguay, the Coast Guard (Spanish: Prefectura Nacional Naval-PRENA) is a part of the Navy. It is tasked with the broader enforcement of maritime laws, especially against smuggling, illegal fishing, drug trafficking and piracy. It patrols the country's coastline, and is also involved in maritime search and rescue (SAR) missions, as well as the protection of the marine environment.
The Uruguayan Coast Guard also frequently patrols coast areas via-foot and on patrol vehicles which they are assigned jurisdictions which are called Subprefecturas. Prefectura is also responsible for the International Port of Montevideo operability.
Even though the Uruguayan Coast guard is a Military Organization they frequently help out law enforcement agencies.
It must also maintain the safety of navigation and be a maritime authority on rivers, the Atlantic Ocean, The River Plate and lakes in the jurisdiction of the Navy and intervene in the flagging of vessels.
In 2015, there are plans for the Uruguayan Coast Guard to pass and depend entirely on the Ministry of Interior, meaning it would not be a military unit anymore.