You may request copies of the veteran's records by downloading and completing a Standard Form 180 (https://www.archives.gov/files/sf180-request-pertaining-to-military-records-exp-april2018-1.pdf ).
On the Standard Form 180, indicate you are requesting Freedom of Information Act (FOIA) information.
You may then mail the completed form to the National Personnel Records Center at the following address:
National Personnel Records Center
1 Archives Drive
St. Louis, MO 63138
You may also fax the completed form to 314-801-9195