What job can you get on the civilian side after being a combat engineer in the Army?

Aside from the most obvious one, working with demolitions (more of it in the civilian work than you may think), 12B''s come out with basic carpentry and construction skills, wheeled and tracked vehicle maintenance skills, and often licensed that would be the equivalent of Class B CDL and often with a Hazmat rating. As a Combat Engineer Platoon and Company Commander, I was required here to carry a Hazmat First Responder rating, as did the Platoon Sergeants.
What's probably more important, that 12B has shown that he has the desire and life skills to be successful since he has survived a tour in the Army. A lot of employers across the Construction trades look seriously at Prior Service people since they are used to maintaining a schedule and being on time, plus being part of a team.

Speaking just for me, I worked in several construction type jobs after leaving the military. Ended up getting NCCCO certifications as a Crne Operator and that’s what I still do and am loving it.
Tuition was paid through my VA education benefits and the starting pay for crane and heavy junk operators I a heck of a lot higher than the labor side of the house. Average start paying for HE is between $15 & $20 per hr. and $20 & $25 for cranes. Experience gets pay increases pretty quickly if you don’t mind travel.
That’s definitely something to check into.
Get back to me with any questions and I’ll be glad to answer the best I can.

Uh, teacher in a public high school???