I don't buy it. Some guys would rather be shot at than endure 8 years of med school. To think your occupation is the only "hard" one out there is extremely ignorant.
I can guarantee I can find a harder occupation than getting shot at in the desert. So if you can only complain if your job is "the hardest" means only one guy on the planet has the right to do it and everyone else needs to just needs to be happy all the time.