I am trying to secure VA eligibility. Any advice?

I AM 74 , MALE AND SERVED 4 YEARS IN THE MISSISSIPPI NATIONAL GUARD, HAVE BEEN TOLD I MUST HAVE SERVED 6 YEARS TO QUALIFY, HOWEVER IN THE 196O'S WHEN I SERVED I WAS ONLY REQUIRED TO SERVE 4 YEARS. I WENT TO 4 YEARS SUMMER CAMPS AND WAS CALLED OUT FOR SERVICE ON THE MS GULF COAST FOR ABOUT 2-3 WEEKS, DATE UNKNOWN. CONTACT :
THANK YOU FOR YOUR PROMPT RESPONSE. KEITH