Mule Fuel Marine Corps Cpl. William L. Stewart feeds a mule during an animal packer course at the Marine Corps Mountain Warfare Training Center in Bridgeport, Calif., Oct. 8, 2020. The course teaches students to use mules to travel through difficult terrain with mission-essential gear. SHARE: Download: Full Size (2.44 MB) Tags: Marine Corps Credit: Marine Corps Cpl. Rachel Young-Porter VIRIN: 201008-M-ZV140-2151A.JPG Photo Gallery