For my side, we ate together, all ranks. 
Once, we went to this other camp where they enforced the
Specialists/Officers and Enlistees queue in the cookhouse quite
strictly.
My friend, who was a LCP went over to the Specialists queue to get
some food, and was stopped by the DOS, who rudely told him that
since wasn't a sergeant he had to queue in the enlisted section.
The LCP told him that he is a Specialist(Armt Spec Techs are
Specialists, regardless of rank).
The DOS didn't believe him, so then one of the 2WOs in our lunch
group, which IIRC had 2 LTAs, 1 2WOs, 3 3SGs and 2 LCPs, said if
the LCP friend of mine had to queue at the enlistees line, then
we're all going over there to queue together.
The DOS promptly apologised. 
