[Milsurplus] Unid radio in Vietnam photo

[Hubert Miller]

I am posting a photo from an article in 'Vietnam' magazine, Summer 2023, p54. The radio just to left of the chopper nose, what is it?
The antenna is "fatter" than a PRC-25 antenna, isn't it? Couldn't be something like an MAY, could it?

Also: Cessna O-2 Skymaster has a wire antenna from ( looks like ) cockpit to left side tail. What radio would that be for, an HF radio ?
and: The crew on something like Ontos M50, which i think was a more specialized job, were those crew also draftees or enlisted?
( I don't know how quickly you could train people to operate such armored vehicle. )
thanks-
Hue Miller
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