if you're looking for something a little more helpful to the world than the military, and not as frustrating as teaching, I'd suggest WWOOFing (
http://www.wwoof.org ). World Wide Opportunities on Organic Farms.
basically, you are given a place to live and food in exchange for working on an organic farm for anywhere from two weeks to a couple months. it usually doesn't pay, but if you know how to travel, it doesn't take much to do it if you have accomodations and food covered =)
or, do like my girlfriend.. she strips, and can, within a few days, strip anywhere she goes and make several hundred dollars in a night for hardly working. whoowhee. I wish there was money like that in [non gay oriented] male stripping.