MARINE CORPS AIR STATION YUMA, Ariz. -- U.S. Marines stationed at Marine Corps Air Station (MCAS) Yuma conduct a Casualty Evacuation run as part of their physical training during Corporals Course at MCAS Yuma, Ariz., May 15, 2019. Corporals Course is a leadership class designed to teach Marines the fundamentals of being a noncomissioned officer. (U.S. Marine Corps photo by Pfc. John Hall)