[Lopeover]

Could be some PTSD going with him, since he is a veteran.

[Hieronymus]

He is only 20—and was listed as active duty for slightly less than four months. That probably indicates that he was discharged other than the most typical way—my guess is that the military found him unfit for active service.

[octex]

Could be some PTSD going with him, since he is a veteran.
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I seriously doubt that 3 months and 3 weeks of active duty would result in PTSD.