Dad issues? need help?

Sadly alot of war veteran's end up like that, they have experiences that we couldnt even fathom happen to them. I doubt he'll get worse and worse off but you might want to introduce a hobby to him, not to sound chidlish in any mean's but a video game could possibly help him find something more to do then just sit on the couch looking mindlessly at the television screen. Video game's atleast allow you to use your own brain for a small portion.