Babylon Five? In the rec room scene ifrom ST:TMP, there was (iirc) a crewmember with a mask that covered his entire face. Must be a very isolating. If Captain Solok was able to fill his command staff with Vulcans who harboured similar view to his own, then any non-Vulcan who was hapless enough to be assigned to Solok's ship could find their lives (both on duty and off) so unpleasent and down right objectionable, that they would soon formally request a transfer. A request that Captain Solok would swiftly authorize. But only after Solok publically berated the crewmember for request one in the first place.