Faced with a bevy of logistical challenges, the U.S. Marine Corps has gone old school in its efforts in Afghanistan.

In the extreme terrain, mules and donkeys are recognized as crucial components of military supply chains. But where do you find recruits skilled in mule packing? As it turns out, you make your own–Mule School is in session at the Marine Corps’s Mountain Warfare Training Center, according to an article from ABC News.  

Mule School (actually called Animal Packing Course) students spend two weeks learning the finer points of mountain packing