There was a pack animal class taught at Ft. Bragg for the SF types. No idea if it is still around. Couple of characters in my unit (20th SFG) attended it.
Equestrian Life - Military Mounts at Fort Bragg
From equine ambassadors to military trainers, the horses of Fort Bragg serve important jobs for our country.
http://www.horsechannel.com/horse-exclusives/Fort-Bragg-military-horses.aspx
I sort of, vaguely remember running across an already old FM on the subject back in the 70s... I think it was written about the time of WWII, maybe even earlier.
Don't remember hearing about any classes on it, but then, in those days, they thought all of us were at least 2/3 pack mule anyway.