Well how many of the barracks had/have AC? The dogs were conditioned to be in those extreme temps. These days dogs are in and out of the AC so the heat feels worse. Personally I love the warmth, as long as I have shade and a cool drink. Hyperthermia is real and serious. Just because these are working dogs, doesn't mean they can't overheat.other than walking on concrete or similar surfaces, why can't a GSD go out for a walk in the hot weather? Do they call off herding when it gets hot, or police work (man or beast!), it seems that the dogs worked in Vietnam during the hot weather?
Sure you take care just like for people but c'mon a GSD should be able to do something even when it gets hot.