Dave is able to survive as well, but he needs modern equipment to be more proficient in doing it. Boots, backpack, etc. I've not been in the military, but I have several friends who have. I think the biggest mistake the military makes in survival training is stressing the need to be properly "prepared". You have to have the full compliment of survival gear to make it. A 40lb ALICE pack of gear is "needed" to survive. That kind of defeats the mental part of survival from the beginning, IMO.
Of course, it does get a bit more complicated when there are vast, hostile armed forces ...
with all manner of modern devastating weaponry ...
hell bent on destroying you ...
and the place that you came from.
That is a bit like the difference between the Marines and the Army.
The Marines have to be able to, with a minimum of gear and support, seize objectives.
The difference is that we [the Army] must be able to seize terrain, deny enemy access, defend terrain, defeat the enemy, and hold terrain ... all of it.
They travel light; we carry
everything ...
to include everything from freakin feather dusters to latrines [environmentalist whackos won't allow us to do it in the dirt ... anymore].
We have to make it safe and comfortable for: politicians, "reporters", "environmentalists", "human rights activists", "anti-war demonstrators", IRC / ACLU / ATLA jerks, and other whackos checking our shorts for forbidden contraband like: pin ups, snuff cans, election voting ballots, etc, etc..