Did the US Marines use Hueys in Vietnam?

Yes they did, but not the long-bodied UH-1D/H Huey as the US Army did. They used the Navalized UH-1E.

“In 1962, the Marines choose the UH-1B Huey to replace their Kaman OH-43D Huskies. Designated UH-1E, the main differences with the Army variant included the use of all-aluminum construction for corrosion resistance, the use of Marines compatible avionics, a rotor brake to rapidly stop the rotor on shipboard use and a roof mounted rescue hoist.”

UH-1B based UH-1E w/counter weights on the main blades

UH-1C based UH-1E w/later 540 rotor system (no counter weights) and longer tail boom.

The UH-1E can be identified by the addition of an external rescue hoist mounted on the starboard side cabin roof.

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