Amphibious Assault: "Beachhead Secured" 1950 US Navy Training Film MN-6707; Operation Portrex, Puerto Rico

more at http://quickfound.net/

Originally a public domain film, slightly cropped to remove uneven edges, with the aspect ratio corrected, and one-pass brightness-contrast-color correction & mild video noise reduction applied.

The soundtrack was also processed with volume normalization, noise reduction, clipping reduction, and/or equalization (the resulting sound, though not perfect, is far less noisy than the original).

https://en.wikipedia.org/wiki/65th_Infantry_Regiment#Operation_"PORTREX"

Wikipedia license: http://creativecommons.org/licenses/by-sa/3.0/

...The 65th Infantry Regiment distinguished itself when the United States conducted a military exercise on the island of Vieques, on the eve of the Korean War. This exercise was code named "Operation PORTREX," an acronym for "Puerto Rico Exercise." The objective was to see how the combined forces of the Army, Marines, Navy, and Air Force would do as "liberators" of an enemy captured territory (Vieques) against the "aggressors." The core of the aggressor ground forces were made up of Puerto Rican soldiers, most of whom belonged to the 65th Infantry Regiment.

The liberators consisted of 32,600 combat troops from the 82nd Airborne Division's 504th Airborne Infantry Regiment and the Marine Corps, who received support from the Navy and Air Force. Despite the large number of troops deployed, the 65th Infantry (the aggressor) was able to halt the offensive forces on the beaches of the island. Colonel William W. Harris, the commanding officer of the 65th, stated:

"Stopping the assault forces at the water's edge proved that the Puerto Ricans could hold their own against the best-trained soldiers that the United States Army could put into the field."

The successful military maneuvers during PORTREX prompted the Army's leadership to deploy the 65th Infantry to Korea...

https://en.wikipedia.org/wiki/Amphibious_warfare

Amphibious warfare is a type of offensive military operation that today uses naval ships to project ground and air power onto a hostile or potentially hostile shore at a designated landing beach. Through history the operations were conducted using ship's boats as the primary method of delivering troops to shore. Since the Gallipoli Campaign specialised watercraft were increasingly designed for landing troops, materiel and vehicles, including by landing craft and for insertion of commandos, by fast patrol boats, zodiacs (rigid inflatable boats) and from mini-submersibles.

The term amphibious first emerged in the USA during the 1930s after design of the Landing Vehicle Tracked where the first prototypes were named Alligator and Crocodile...

https://en.wikipedia.org/wiki/Amphibious_assault_ship

An amphibious assault ship (also referred to as a commando carrier or an amphibious assault carrier) is a type of amphibious warfare ship employed to land and support ground forces on enemy territory by an amphibious assault. The design evolved from aircraft carriers converted for use as helicopter carriers (and as a result, are often mistaken for aircraft carriers), but includes support for amphibious landing craft, with most designs including a well deck. Coming full circle, some amphibious assault ships now have a secondary role as aircraft carriers, supporting V/STOL fixed-wing aircraft.

The role of the amphibious assault ship is fundamentally different from a standard aircraft carrier: its aviation facilities have the primary role of hosting helicopters to support forces ashore rather than to support strike aircraft. However, some are capable of serving in the sea-control role, embarking aircraft like Harrier fighters for CAP and anti-submarine warfare helicopters or operating as a safe base for large numbers of STOVL fighters conducting air support for the Marine expeditionary unit once it has gone ashore. Most of these ships can also carry or support landing craft, such as air-cushioned landing craft (hovercraft) or LCUs.

The largest fleet of these types is operated by the United States Navy, including the Tarawa class dating back to the 1970s and the larger Wasp-class ships that debuted in 1989. Amphibious assault ships are also operated by the French Navy, the Italian Navy, the Republic of Korea Navy, the Royal Australian Navy, the Royal Navy of the United Kingdom, the Spanish Navy and Armada de Chile.

Although the term amphibious assault ship is often used interchangeably with the more-general term amphibious warfare ship, it specifically applies only to large-deck amphibious ships such as the Landing Platform Helicopter (LPH), Landing Helicopter Assault (LHA), and Landing Helicopter Dock (LHD) types. This does not include the amphibious transport dock (LPD), and dock landing ship (LSD)...