I doubt that it is possible to double major with an engineering degree and a non-engineering discipline, or even to get a non-engineering minor, at most universities - not even taking ROTC commitments into account. The engineering curriculum must conform to national accreditation standards, which have so many required classes that there is very little room for other subjects; and at most schools, much of your non-engineering coursework will be taken up with general education requirements common to all students. Your mandatory ROTC classes will also have to be squeezed in. I suppose it is possible that there are universities which don't place a limit on how many units you an take in a semester, so perhaps it would be theoretically possible to do so. It would also be counterproductive, and I can't imagine that anyone would encourage you to even try. Combining engineering with ROTC is challenging enough, and you will be far better off getting good grades with a normal course load than struggling to keep up with a heavy overload. You can always pick up an MBA once you have started your career.
