After being pressed into service, the CH-46A did not pack sufficient punch for Vietnam fight. So by 1966, the Sea Knight’s efficiency was enhanced with the introduction of the CH-46D, which had extra highly effective 1,400 horsepower engines and a modified rotor design that facilitated carrying as much as 25 troops or 7,000 kilos of cargo. One more iteration, the CH-46F, emerged in 1968 with an improved navigation system and higher all-weather flying traits.
The Marines Corps flew the helicopters all through the length of the Vietnam Warfare, shuttling troops and gear to the entrance strains and evacuating the wounded. Sooner or later in the course of the battle, the Marines deserted the formal Sea Knight monicker and commenced calling them “Phrogs,” undoubtedly as a result of craft’s frog-like look when considered from the entrance. Sadly, the elevated capability that made them such an asset as a utility-transport helicopter additionally created the legal responsibility of being a straightforward goal. In whole, over 100 phrogs had been shot down.
The CH-46’s ultimate position in Vietnam was the rescue of almost 8,000 folks from the U.S. Embassy in the course of the fall of Saigon in 1975. It was dubbed “Operation Frequent Wind.”