Pfc. Brodie Cantrell, a volunteer with the Single Marine Program aboard Marine Corps Air Station Miramar, and a Slaton, Texas, native, runs alongside a student at Miramar Ranch Elementary School in San Diego, April 29. The Marines volunteered for a P.E. Fitness Challenge, an event which allowed children and Marines to complete a series of exercises throughout the course of the school day. (U.S. Marine Corps photo by Sgt. Lillian Stephens/Released) - Pfc. Brodie Cantrell, a volunteer with the Single Marine Program aboard Marine Corps Air Station Miramar, and a Slaton, Texas, native, runs alongside a student at Miramar Ranch Elementary School in San Diego, April 29. The Marines volunteered for a P.E. Fitness Challenge, an event which allowed children and Marines to complete a series of exercises throughout the course of the school day. (U.S. Marine Corps photo by Sgt. Lillian Stephens/Released)