"... Though not as morbid, I would imagine "stepping over dead bodies" and "leaving teammates behind" is a rather common experience in startups as well, though potentially frowned upon (but even then, it would depend on the situation). ..."
You're kidding right?
Working in a Startup, in a cushy office with access to water, food & external help is not in the same league as roughing it. Having said that the lessons you learn in the field can be directly applied to Startups. The constraints on resources, the stresses, the lack of knowledge and uncertainty. That's where the comparisons end. If you can't hack it - you can go home. In the field, you never leave anyone behind . Never!