Derell Echos practices throwing shot-put during the 2014 Marine Corps Trials aboard Camp Pendleton, Calif., March 4, 2014. The Marine Corps Trials is an 8-sport invitational involving four competing teams comprised of active duty Marines, veterans and international service members. Athletes will have the opportunity to compete in an eight-sport competition to include archery, shooting, wheelchair basketball, sitting volleyball, swimming, cycling, track, and field events.