Cut and Dry, tell them what you want to do and they put you in it. You do have to qualify for what MOS you want to get into, however they will coach you along with what you can do if your scores are not where they need to be.

Recruiters were pretty straightforward with me. Some recruiter lie to potential recruits, but if you come in educated about what you want to do and what your current education and commitment levels are, it's a simple process. Never join for the money. Your life is highly likely to be on the line at one point or another no matter how simple of a job pick.