Take the military contract to a former JAG officer. I would do a google search to find someone that has that experience. It is always a difficult thing suing the government (most of the time you can't) but if you have a contract, both parties should abide by it. Best of luck.
I am a Florida Licensed Attorney and this information is for general information purposes only. Please note that this answer does not constitute legal advice, and should not be relied on, since each state has different laws, each situation is fact specific, and it is impossible to evaluate a legal problem without a comprehensive consultation and review of all the facts and documents at issue. This answer does not create an attorney-client relationship.