Athletes listen carefully as retired Master Sgt. Dionisios Nicholas gives them instructions prior to their relay of shooting in the air pistol competition at the Marine Corps Trials aboard Camp Pendleton, Calif., March 10, 2014. The Marine Corps Wounded Warrior Regiment enables wounded, ill, or injured Marines to focus on their abilities and to find new avenues to thrive. The fourth annual Marine Corps Trials is being held at Marine Corps Base Camp Pendleton, Calif., March 4-12. Athletes will compete in archery, cycling, shooting, swimming, track, field, sitting volleyball, and wheelchair basketball.