An airman has collapsed on the fligh-tline because of the heat and you suspect it may be heat stroke what must you do immediately?

If they are unconscious check the ABC's, Airway Breathing and Circulation. If those are acceptable then move the airman to a cool, shaded place. Loosen/remove all excess clothing (if need be, down to underwear). a cool wet towel or shirt can be put under the armpits or in the groin to help cool. In the military you would also give the airman a large bore IV (18 gauge works nicely) of normal saline. It is very important at this stage not to give anything for them to eat or drink, even if they wake up.