Here’s a handy government web site where you can request copies of military veterans records: http://www.archives.gov/veterans/evetrecs/index.html

I copied the below info from the web site:

eVetRecs:
Request Copies of Military Personnel Records

Welcome to our online military personnel records request system.

Use our system to create a customized order form to request information from your, or your relative's, military personnel records. You may use this system if you are:

• A military veteran, or
• Next of kin of a deceased, former member of the military

• The next of kin can be any of the following: surviving spouse that has not remarried, father, mother, son, daughter, sister, or brother.

If you are not the veteran or next of kin, you must complete the Standard Form 180 (SF 180). See Access to Military Records by the General Public for more details.