SERE = Survival Evasion Resistance and Escape
It basically gives you the mindset on how to survive during a worse case scenario. What is safe to eat, what's poisonous, what not to use as toilet paper, etc.
Its a required course for combat aircrews, special operations, and a good chunk of the intelligence community. The last two groups are the last people on earth I'd want to call a bunch of fags.