If a Ranger was riding in rough hill country a mule is the mount of choice. Note riders to thee bottom of the the Grand Canyon ride mules. They're more sure footed that horses unlike horses will never place themselves in danger- stubborn ? Yes, but they're smart too.Post 18 is the Historical Foundation document that names Jomer. It is a letter from Potchernick's written in 1936. The letter writer has been dead for many years. The history letter signed by Don Mundell just says FBI agent. There are no other documents that I know of that would clear things up for you.