Allowing Lt. Bailey to be a bridge officer in The Corbomite Maneuver, he never should have been assigned there in the first place. I don't know how he ever got to be a Lieutenant, given how hard it's supposed to be to get through Starfleet training. The man was obviously unhinged and McCoy was right when he pointed out that Bailey shouldn't be in that position. It puts the whole ship in danger if a command isn't carried out because a bridge officer is having a psychotic episode, screaming at everyone.