Test and Train Two Marine Corps M142 High Mobility Artillery Rocket Systems drive to a test and training range at Hill Air Force Base, Utah, Jan. 23, 2020, during Emerald Warrior, an exercise that provides realistic pre-deployment training. SHARE: Download: Full Size (1.37 MB) Tags: Air Force Credit: Air Force Tech. Sgt. Sandra Welch VIRIN: 200123-F-HF922-0117M.JPG Photo Gallery