Army Reserve Soldiers cheer on participants as they approach the "Berlin Wall" obstacle during the Tough Mudder event held in Plymouth, Wis., Sept. 6. Tough Mudder events are obstacle courses designed to test competitors’ all around strength, stamina, mental grit and camaraderie. Tough Mudder has hosted more than one million participants worldwide to date, and raised more than $6.5 million for the Wounded Warrior Project. The Army Reserve chose to sponsor Tough Mudder recognizing that participants possess many of the same values and motivations as Soldiers to include resiliency, teamwork, the drive to excel and being part of something larger than themselves, said Joseph Adams, events director for the Army Marketing Research Group.