True.Well in all honesty, the soldiers dont have iPhones or any Android phone in that case (for certain zones) not because of the SOS feature I would have to say, as it is only activated by the person. But because of the constant pinging of any cell network device to local towers.
My comment was more on the "airplane" mode setting with iPhone.
Side note when I'm up in the hills my iphone is in default SOS mode quite a bit.