[DanUCSB]

While I am not SF-qualified (yet!), I am a soldier, and more cogently, currently also a university student. As for majors, while there is no 'best' one, I do believe that there are some that are better than others. If you're inclined to the humanities, then history is the king. Humans don't change--the same fears, desires, and motivations that have existed down through the centuries will continue to take place into the future. And the best way that we, as humans, have to understand the future, is to understand the past. For sciences, I'd say economics... economics is the master science that goes a -long- way in explaining just about everything that goes on in this world, from political science to international affairs to business.

The most important thing, however, is choosing something that you will enjoy. The future is always uncertain: you could get stuck in the regular Army, for instance, or find yourself not in the Army at all; even if you do serve out until retirement, you've still got decades of life left afterwards. So the key is doing something that you love. I know it's a cliche, but it's true: if you find a job you love, you'll never work again.