I know my history quite well. “Skinny dipping” was always consudered, in my lifetime, a somewhat surreptitious activity. Men didn’t walk up to the pool, around others, and whip down their drawers and hop in. At least not in my upper-middle class milieu. And just like they could have asked for reassignment, which would have likely been a demotion, he could have just worn a swimsuit like a normal person.
Sorry, but you need to know your history a bit better.. It was norm for men to swim naked, one of the reasons women were not allowed in health clubs etc, or if they were at only dedicated times.. Do a little research, you might learn something.
And as I said elsewhere this is a non issue, unless he was harassing them the fact he swam naked is not an issue. The Secret Services Job is to Protect, NOT to tell the person how to live, they are not there to behave how their bodyguards wish them to behave. If the female SS agents were uncomfortable guarding someone who likes to swim naked, that’s their issue, not his... and they should have requested transfer.
This is a non issue.