Hey mate, you don't need to be ex-military to have (need) survival skills and I think it's so important that you're opening little E up to how to work with his hands, how to create for himself. We've spoken about this before and you involve him in a lot of DIY stuff but to add in some survival skills, the appreciation for preparedness and the ability to take care of some of the most basic things...Well, it's just smart and will probably either lead him further down that path or identify that he hates it. Either way is fine. (Methinks he'll love it).
I have so many skills, survival, outdoors, navigation, hunting, trapping, shooting etc. but no little person to teach them too so most will die with me...But you have the ability to help that little dude shape himself into a confident adult with skills so well done.
Having the skills I have brings me a lot of confidence and self-reliance can only be a good thing right? Keep it up.
P.s. If you haven't checked out @paradoxtma you should do so. Some good shit bro.