I think Chemar is right. It doesn't make sense they would send him back if they know he's been under care for PTSS. Tell him to talk to military medical about it. Was he seeing a civilian doctor or the military/veteran's hospital? You can also ask him to contact the local PVA chapter and see if they can help. PTSS is very serious and veteran hospitals are taking it serious.
Either way, my prayers are with you all.