Please follow this link for a complete answer to this question.
Understanding the Claims Process
Visit http://www.mitalent.org/veteran/
Visit the Small Business Administration for information –
link: http://www.sba.gov/content/veteran-service-disabled-veteran-owned
This situation requires building a case that you indeed did injury yourself during your time in service. This is not impossible, but it may take time to build. Visit an accredited veteran service officer to find out if a case can be built. www.mivabenefits.org/find
If you served during a war-time era, it is possible you qualify for a VA Non-Service Pension which is based on service and income. Visit an accredited veteran service officer to find out more. www.mivabenefits.org/find