Textbooks?? We got textbooks now?? Back in the day, there was no such thing. It wouldn't have worked anyway, since available knowledge would have been chiseled into blocks of stone - not very portable not easy to edit or revise.

Actually, clothing is quite important, since operations will be conducted frequently in extreme conditions. I always carried a bit more, because fairly frequently I would provide better clothing for our victim, and still have enough for me. You do need really good stuff.

I note the price - they are not exactly giving this precious knowledge for free.