Who benefits from Radio Operator vitality? Machine Gunners?

I apologize if this is a silly question, but do any crew members actually benefit from the Radio Operator vitality crew skill? I can’t seem to find any tanks that have a radio operator, but there are a lot that have extra machine gunners inside such as the Sherman and T-28E. I don’t want to be investing crew XP into it if the skill doesn’t benefit anyone.

The repair speed and reaction time are determined by the average of the skill points of all crew members, including the radio operator.

I knew that, but I was asking specifically about vitality as I know that it affects each crew member individually. Like the drivers vitality affects the driver, the gunners vitality affects the gunner, etc.

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Radio operator is the 5th crewman is tanks that have that many I believe they are always labeled as machine gunners, I think its just a catch all for any crew that are not labeled as driver, gunner, loader or commander.
What I don’t know is when a crewman changes positions, do they keep their original HP or dose it change to the HP of that position?

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Some vehicles with a fifth crew member may require investment in the Radio Operator’s vitality. I currently main the Chinese tech tree, so my Type 99A doesn’t need a Loader’s vitality, but my M1A2T does. By extension, if certain vehicles have a fifth crew member—even if they’re designated as, say, a Gunner or something else—the corresponding stat in the crew panel should be the Radio Operator’s.

However, I don’t recommend maxing out a single crew to the highest level. Sometimes I stop around level 145 and allocate the surplus experience to my air crew instead. The future infantry mode will likely require a lot more experience.

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Ah my air crews are already maxed out and I don’t play Navel. But I haven’t invested anything at all into Radio Operator vitality so I think at least the lower levels would be worth it for me then, especially since a lot of the vehicles I like tend to have a 5th crew member like the Chi-Nu and KV-1. Thank you for the clarification!