Petty Officer 2nd Class Daniel Wagner, right, a hospital corpsman with Headquarters Battalion, 1st Marine Division, instructs Lance Cpl. Aaron Brown, a motor transport operator with the battalion, during a physical therapy session at Marine Corps Air Ground Combat Center Twentynine Palms, Calif., May 14, 2014. The battalion is in the middle of Exercise Desert Scimitar, a I Marine Expeditionary Force live-fire exercise. Wagner, a native of Parker, Ariz., improvises in the field to help service members maintain and progress in their medical treatment. He developed resistance and stretching techniques with a piece of workout equipment to help Brown with his strained shoulder.