I'm not going to downvote you for it, but this is terrible advice. If you're graduating form high school and don't know what you want to do for a living, don't make a multi-year commitment to a job that has a very significant chance of ruining your life. You can get out of waiting tables after 12 months if you want to, but you can't just drop out of the army, and waiting tables has a significantly smaller chance of removing one or more of your limbs.