There are many many many more ways to help our country and our service men/women than by signing-up. Not that its a bad option - but don't limit yourself to thinking you have to pull a trigger to make a difference. One great way you can help is to volunteer your time on base teaching classes or mentoring folks who want to learn what you have to say (you have a degree in computer security and that is a highly sought after skill right now). Help put on career events.. Get your employer involved with military hiring.. There are a thousand things you can do. All you really need to do is just ask.
That said - if you want to skew your career slightly you can always turn your talents to helping the DoD. Lots of contractors hiring, lots of work to be done. You would be surprised at the amount of good you can do without putting on a uniform.

