At 3 Joint Operation Center we worked with Brits, Germans, Dutch and Belgians. These troops were air force. Once a year or so there would be an exercise and army HQ troops would come and man their respective offices. The highest rank I recall seeing was a Brit Brig. Only once during my tour do I remember American troops manning positions in the caves. Our jobs as communicators never changed except for the increase in traffic.
I encountered said Brig in the main washroom on his first time being there. (no rank segregation) The cement floor was always in puddles of water due to sweating pipes and poor ventilation. He asked me if it was always like this, to which I replied "no sir, it's usually worse but they cleaned it up for the exercise.