The Trinidad and Tobago Defence Force (TTDF) is the military organization responsible for the defence of the twin island Republic of Trinidad and Tobago. It consists of the Trinidad and Tobago Regiment, the Trinidad and Tobago Coast Guard, the Trinidad and Tobago Air Guard and the Defence Force Reserves.
A patrol boat is a relatively small naval vessel generally designed for coastal defence, border security, or law enforcement. There are many designs for patrol boats, and they generally range in size. They may be operated by a nation's navy, coast guard, police, or customs, and may be intended for marine, estuarine, or river environments.
The River class is a class of offshore patrol vessels built primarily for the Royal Navy of the United Kingdom. A total of nine were built for the Royal Navy (RN), four Batch 1 and five Batch 2. One Batch 1 (HMS Clyde), which was the Falklands guard ship, was decommissioned and transferred at the end of its lease to the Royal Bahrain Naval Force.
The Royal Brunei Navy is the naval defence force of Brunei Darussalam. It is a small but relatively well-equipped military force whose main responsibility is to conduct search and rescue missions, and to deter and defend the Brunei waters against attack mounted by sea-borne forces.
HMS Clyde was an offshore patrol vessel and was the tenth Royal Navy vessel to carry the name. She was launched on 14 June 2006 in Portsmouth Naval Base by VT Group shipbuilders in Portsmouth and is the fourth vessel of the River class, with a displacement of 2,000 tonnes and a 30 mm Oerlikon KCB gun in place of the 20 mm gun fitted to Tyne River-class ships. Clyde was decommissioned on the 20 December 2019 at HMNB Portsmouth and was returned to her owners at BAE Systems Maritime - Naval Ships, although the ship remained under lease from BAE Systems to the Royal Navy until the end of March 2020. In August 2020 Clyde was transferred to the Kingdom of Bahrain.
HMS Duncan is the sixth and last of the Type 45 or Daring-class air-defence destroyers built for the Royal Navy and launched in 2010. Duncan is named after Adam Duncan, 1st Viscount Duncan, who defeated the Dutch fleet at the Battle of Camperdown on 11 October 1797. The destroyer has served in the Mediterranean, Black, and Caribbean Seas, and in 2019 was deployed to the Persian Gulf in response to increased tensions with Iran in the region.
BAE Systems Maritime – Naval Ships is a wholly owned subsidiary company of BAE Systems, specialising in naval surface shipbuilding and combat systems integration. One of three divisions of BAE Systems Maritime, along with BAE Systems Submarines and BAE Systems Maritime – Maritime Services, it is the largest shipbuilding company in the United Kingdom, one of the largest shipbuilders in Europe, and one of the world's largest builders of complex warships.
The OPV-80 class is a class of offshore patrol vessels that are currently operated by the Chilean Navy and Colombian National Navy.
The Khareef class are three corvettes operated by the Royal Navy of Oman. The ships were built by BAE Systems at their shipyard in Portsmouth, as part of a £400m deal it also included training by VT Group.
HMS Orkney was an Island-class patrol vessel of the Royal Navy. In 2000 she became TTS Nelson of the Trinidad and Tobago Coast Guard. In 2016, the vessel was sold for scrap.
HTMS Krabi (OPV-551) is an offshore patrol vessel (OPV) of the Royal Thai Navy. She is a modified River-class patrol vessel, and was built by Mahidol Adulyadej Naval Dockyard, with design and technology transfer support from BAE Systems Surface Ships. Additional construction took place at the Royal Thai Navy Mahidol Dockyard in Sattahip.
The Darussalam-class offshore patrol vessel is a class of four offshore patrol vessels constructed for the Royal Brunei Navy. They are the largest and most capable ships of the Royal Brunei Navy, and often participate in international naval exercises.
HMS Forth is a Batch 2 River-class offshore patrol vessel in active service with the Royal Navy. Named after the River Forth, she is the first Batch 2 River-class vessel to be built. She was commissioned into the Royal Navy on 13 April 2018, following a commissioning ceremony at her homeport HMNB Portsmouth. In January 2020 she replaced HMS Clyde as the Falkland Islands patrol ship.
HMS Tamar is a Batch 2 River-class offshore patrol vessel of the Royal Navy. Named after the River Tamar in England, this is the seventh Royal Navy ship to be named Tamar. She is the fourth Batch 2 River-class vessel to be built and is forward deployed long-term to the Indo-Pacific region with her sister ship HMS Spey.
HMS Spey is a Batch 2 River-class offshore patrol vessel of the Royal Navy. Named after the River Spey in Scotland, she is the eighth Royal Navy ship to be named Spey and is the fifth Batch 2 River-class vessel to commission and is forward deployed long-term to the Indo-Pacific region with her sister ship HMS Tamar.
HTMS Prachuap Khiri Khan is the second Krabi Class offshore patrol vessel (OPV) of the Royal Thai Navy.
Amazonas (P-120) is a Amazonas-class offshore patrol vessel currently operated by the Brazilian Navy. She was originally named Port of Spain (CG50) while she was being built for the Trinidad and Tobago Coast Guard.
Apa (P-121) is a Amazonas-class offshore patrol vessel currently operated by the Brazilian Navy. She was originally named Scarborough (CG51) while she was being built for the Trinidad and Tobago Coast Guard.
Araguari (P-122) is a Amazonas-class offshore patrol vessel currently operated by the Brazilian Navy. She was originally named San Fernando (CG52) while she was being built for the Trinidad and Tobago Coast Guard.
At least two ships of the Brazilian Navy have borne the name Araguari
Brazilian Navy 
