The laws may have changed since my military time ,but there were only 5 types in my day . Not sure if I remember them all but here goes, ( 1 ) honorable ( 2 ) General , which turned hororable after 6 months if you kept your nose clean . ( 3 ) covinence of the Govn't , that covered many reasons including hardship. ( 4 ) Bad conduct discharge , self explantory. ( 5 dishonorable . In my day a Captians mast could not issue a discharge only a court martial could initiate that. If I were in your shoes, I would give that discharge another look over and get in touch with the VA regional office in NOLA or go to VA.Gov to find out more. Hope this helps.