Re: Captain Sisko in First Contact
The regulation may have a different name, but I'm pretty sure a CMO would have the ability to relieve a captain under those conditions.
Regardless of universe.
Kirk and Matt Decker were both threatened to be relieved of command due to emotional duress.
"You know. 1966? Seventy-nine episodes, about thirty good ones." - Phillip Fry describing Star Trek, Futurama