Today a Specialist and a Specialist promotable I know got into an argument about who was actually higher in rank. The Specialist non promotable had more time in grade but the other Specialist was promotable. I read the regulation and it does not say anything about promotion status having anything to due with precedence of rank. The AR I read was AR 600-8-19. It has always been my general understanding that the promotable would be of a higher rank but according to this regulation it plays no part in telling who is senior. Does anyone know of any regulation that can clarify this?