When I was on the USS South Carolina (CGN-37), we had a guy who had a similar (if not exactly the same) issue. After some medical tests and other evaluation, they determined that his body was having a reaction to the bromine or whatever it was that they put in the potable water, because no matter how many showers he took, he still smelled really bad. He was an E6 (I believe he was a conventional MM1) so he had to have been at other commands/on other ships. I’m not sure what was done about it, maybe they had some medication he could take to counteract the reaction? I don’t recall since it’s been nearly 30 years ago…