How to get a copy of your military discharge papers (DD Form 214 or SF-180)
The National Archives and Records Administration Military Personnel Records Center is the official repository for records of military personnel who have been discharged from the U.S. Air Force, Army, Marine Corps, Navy and Coast Guard.
Requests using DD 214 can come from veterans or their next of kin. The SF-180 is used for requests for records about a veteran by the general public.
Start your request here using their online tools or you can make the request by fax or postal mail using the contact info provided at the link above. Such requests are generally free (see details at the linked site).