Depends what your goals are. I haven't been in the military, but I know that it's nothing like the commercials. And I know that most soldiers are bored to tears and the most exiting part of their day is if they get something in the mail.
If you have a knack for writing, you could run a travel blog, write for a publisher like Lonely Planet, etc.
There are many, many ways to achieve those goals that don't involve joining the military.