You can request additional military information from the
National Personnel Records Center.
Some of the information you have on the discharge papers will
help to complete the form (SF-180.)
You also need to be the person requesting the info or next of kin.
It can take several months for a reply because the reply is a
package of hand zeroxed pages.
(Type of info can be; units assigned to, where and when stationed,
schools, promotions, etc.)
Good luck.
Bill
See the website
HERE