I was instructing at an Air Force Flying Club. The control tower at the Air Force Base was a training tower. A student controller had a couple of F15's in the pattern, me in my cessna bug smasher and an Army Blackhawk helicopter inbound. The student controller became task saturated and told the Blackhawk helicopter to "Go Around". The Army pilots obviously were a little surprised about the instruction, replied "Ah...OK...Go Around". After a short pause the Blackhawk pilot said, "Tower, you know we're a helicopter, we can stop right here if you want". The student controller replied "Ah...OK...continue inbound and remain clear of the traffic pattern.