Paying for Graduate school with a gov't job?!?

Next year I will start working towards my masters in Social Work. The only set back, however, is whether or not I'll have the money to pay for it. I'm curious to know if there are any government public service jobs that will help an individual pay for their loans/ absolve the loans completely if the person agrees to work for a while in an under-represented job. I'm just looking for suggestions as a jumping off point, because the idea of graduating and being nearly 100,000$ in debt is terryfing.