Did he think he was applying for the TEXAS Rangers?
As for the TEXAS Rangers: If you're talking about the Law Enforcement organization, they've probably killed more people than the Army Rangers.
If you're talking about the baseball team..... well, they just choke and die.
You just have to shake your head at guys like this. He volunteers for the Rangers but is opposed to killing people? It's probably a BS excuse. He most likely got sick of the military and wanted out.