Basic chemistry, biology and physics, to make weapons and know how to launch them.
I'm not a bad diy'er so could build, and farm.
Basic to intermediate mechanical skills.
Trained fighting knowledge if I need to amass and army of ninjas.
I can work out almost anything without instructions
Born leadership/dictator skills
No remorse or fear of killing and death (when the jobs needs doing in apocoloto style warfare)
If it's zombie apocalypse then I would have those hungry dead on lock down.
If it's me vs other humans, you better run.
so the world has almost eneded through wars and you want to start another one? the last thing i'd want is a gun