I just returned early this a.m. from the Mountain Warfare Training Center near Bridgeport, CA, where I attended and passed the Animal Packers Course.
I am now a certified Animal Packer(!)
The course required us to learn several basic and necessary hitches and knots, equine anatomy, loading various types of gear on mules, movement considerations, CASEVAC, etc.
The apex of the course required a week-long excursion out into the wilds of MWTC, over the several ranges and training areas, stopping at certain LZs for nightly bivouac.
(Note about mules-- they've earned their reputation!)
Here are some sketches I did while in the course: