Ron Thomas gave you some very good advice below. I know you feel like you are in a miserable situation, but it's important to weigh the facts of the situation.
There are many things to consider that can't be covered on an Internet forum like this. Best advice is to speak with a Real Estate attorney (preferably one experienced working with active duty clients).
Depending on your situation and your goals, there may be better options for you than a short sale.
Make your decision based upon your head and not your heart and you'll find the best solution for your family!