https://peertube.dngr.us/videos/watch/991ccb36-ad69-4b05-bfa6-863baa63d36b Created in the post-Korean War era but before the Vietnam War, "Vertical Envelopment" explains the new tactics put in place by the U.S. Navy and Marine Corps to land troops by helicopter and secure a beachhead in nuclear and non-nuclear warfare scenarios. The film also examines other aspects of amphibious assault in the present and future, including new amphibious warfare ships, the use of VTOL aircraft and guided missiles such as the Regulus, and above all the use of the helicopter and the speed and flexibility it allows, to outflank and outmaneuver the enemy. After WW II, the Marine Corps introduced a new dimension in the mobility of assault troops and logistically resupply with the advent of the helicopter. Vertical envelopment was developed at the Marine Corps Base in Quantico and proven during the Korean War. As a direct result of the atomic tests at Bikini Lagoon, in 1946, the Marine Corps sought innovative ways to disperse assault forces during amphibious landings. The Marine Corps Schools at Quantico produced the concept for using the helicopter and helped pioneer the development of HMX-1 as the vehicle for testing the new vertical envelopment concept. HMX-1 was the first Marine helicopter squadron and as such virtually set the pace in the development of combat helicopter thinking. The laboratory at Quantico would in 31 short months prepare the Marine Corps to go to war for the first time with helicopters. HRS-1 helicopters are seen throughout, also known as The Sikorsky H-19 Chickasaw, or S-55, was a multi-purpose helicopter used by the United States Army and United States Air Force. It was also license-built by Westland Aircraft as the Westland Whirlwind in the United Kingdom. United States Navy and United States Coast Guard models were designated HO4S, while those of the U.S. Marine Corps were designated HRS. In 1962, the U.S. Navy, U.S. Coast Guard and U.S. Marine Corps versions were all redesignated as H-19s like their U.S. Army and U.S. Air Force counterparts. Motion picture films don't last forever; many have already been lost or destroyed. We collect, scan and preserve 35mm, 16mm and 8mm movies -- including home movies, industrial films, and other non-fiction. If you have films you'd like to have scanned or donate to Periscope Film, we'd love to hear from you. Contact us via the link below. This film is part of the Periscope Film LLC archive, one of the largest historic military, transportation, and aviation stock footage collections in the USA. Entirely film backed, this material is available for licensing in 24p HD and 2k. For more information visit http://www.PeriscopeFilm.com Source: https://www.youtube.com/watch?v=si_2pM3onSo Mirrored from Periscope Film (https://www.youtube.com/@PeriscopeFilm) Sat, 13 Jun 2026 05:32:30 GMT https://validator.w3.org/feed/docs/rss2.html PeerTube - https://peertube.dngr.us https://peertube.dngr.us/lazy-static/avatars/41a6fee9-7f57-42d0-a5fc-5db4f1af2e31.png https://peertube.dngr.us/videos/watch/991ccb36-ad69-4b05-bfa6-863baa63d36b All rights reserved, unless otherwise specified in the terms specified at https://peertube.dngr.us/about and potential licenses granted by each content's rightholder.