Grand Prix Series Trifecta consists of three extreme races: Extreme Endurance Challenge (Feb. 7), St. Paddy’s Day Engineer Challenge (March 14), and the MARSOC Mud, Sweat &Tears (April 25). Together, these three races will test your strength, stamina, endurance and commitment. What makes this series unique is that runners will compete against and with America’s toughest fighting force, the U.S. Marine. Each race is held aboard Marine Corps Base Camp Lejeune and its surrounding camps on actual Marine Corps training courses. The courses include a variety of obstacles, mud crawls and challenging features, both man-made and natural. If you compete in all three races in 2015, you will become a member of an elite club. To celebrate your accomplishment, you will receive a Trifecta T-shirt and medal. Registration is now open for all three races. For a registration form and more information, visit mccslejeune.com/grandprix or send email to lejgrandprix@usmc-mccs.org.