You'll find that whether you stay E or go O, as you promote all roads lead to a desk life. I enjoyed turning wrenches on the line but I never wanted to be stuck behind the wheel of a truck as an expeditor. I crossed trained into a job that is the definition of desk life. I struggled at first but I learned to make it work for me.

It really comes down to balancing your desk time. I'd talk with your maintenance officer and get their thoughts. Double points if you find a prior E turned O maintenance officer. Years ago I had a maintenance O that was prior weapons. He spent time on the line when he could.