Not that many actually are former military and there are vets in every state not every vet is a gun lover either I know vets that refuse to even own firearms ones that used them to kill at one point in their lives.Your stretching things.
Charles Whitmann got kicked out of the Marines and he never even saw combat he learned marksmanship from his father.Seems to me if anything like he was off all along though his dad was abusive to him and his family.
http://en.wikipedia.org/wiki/Charles_Whitman