MARINE CORPS AIR STATION YUMA, Ariz. -- U.S. Marines with Marine Wing Support Squadron (MWSS) 371 participate in a Mud and Fording Course at Cibola Lake Mud course and Fording Basin, Yuma Proving Grounds Ariz., May 21, 2019. The mission of the MWSS-371 Mud and Fording Course is to enhance motor vehicle proficiency while in a wet and humid environment. (U.S. Marine Corps photo by Lance Cpl. Joel Soriano)