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The clipper ship (Out of many, 5th edition, volume one)
Mainly gunboats/patrol boats.
Sloops are fast and maneuverable
See website: Patrol Torpedo Boats (PT Boats)
Traditionally it was vessels under 200 feet long. Vietnam Riverine Boats (Brown Water Navy) were all considered boats; Swift Boats (PCF-Patrol Craft Fast), PBR's (Patrol Boat River), Monitors (River Battleships), and Alpha Boats (ASPB-Assault Support Patrol Boats). Blue Water Naval vessels were Frigates, Destroyers, Cruisers, etc.
Commonly referred to as Patrol boats, the North Vietnamese Navy P4s were actually torpedo boats which attacked the USS Maddox on 02 August 1964 in the Tonkin Gulf.
Flores class sloops was created on 1926-03-25.
The Northern navy consisted primarily of Soviet/Chicom (Chinese Communist) supplied P4 & P6 torpedo and patrol boats. The Southern navy consisted of newly transferred/acquired (former USN) Swift Boats (PCF-Patrol Craft Fast); PBRs (Patrol Boat River); Alpha Boats (ASPB-Assault Support Patrol Boat); and Monitors (40mm and 105mm cannon armed riverine battleships).
The North Vietnamese Navy had Patrol Torpedo Boats; the South Vietnamese Navy countered with (US) Swift Boats.
To give them air support.
Yes. Nowadays, Mexico has a Navy staffed with 56,000 people, and includes several frigates, destroyers, corvettes and patrol boats. Most ships were bought from the U.S., Spain and Israel with some patrol boats built in Mexico.
The US Navy's Riverine Forces were part of the US Navy's Brown Water Navy; only the second time it was created. The first time was the US Civil War (1861-1865). The Brown Water Navy (Riverine Forces) used: Swift Boats (PCF-Patrol Craft Fast, all aluminum 50' foot long boats); PBR's (Patrol Boat River-fiberglass 32 foot long boats); Alpha boats (ASPB-Assault Support Patrol Boats, all steel contructed boats); and Monitors (River Battleships).