OP stated upthread that it was it was a mistake, wrong guy and wrong mother. So the statement about talking to his mom about to Vegas has been walked back.
Regardless, how would blowing himself up in a truck be an act of protection of the newborn? It was an act of terrorism and apparently against the President-Elect of the United States and his associates. By a member of the U.S. armed forces at that! Probably too late for a dishonorable discharge, although don't know how the military deals with this kind of situation, if there is any action to be taken post-humously.