Your government most likely already has conservation plans for any endangered species and most likely will not involve random citizens to help breed and release animals. There is a lot of work that goes into releasing and monitoring game bird populations and there is usually no profit when it comes to endangered species. There is also a lot of legal issues, permits, and papers that are involved with raising any protected birds in the US. Most endangered species are protected and not available to the public. You might be able to volunteer in a conservation project that your state already has in place if you are really determined to help out an endangered species.