Amphibious Assault Vehicles from the 31st Marine Expeditionary Unit, move across Freshwater Beach at the Shoalwater Bay Training Area, Queensland, Australia, on May 25, 2001, prior to being back-loaded during Exercise Tandem Thrust 2001. Tandem Thrust is a combined military training exercise involving more than 18,000 U.S., Australian, and Canadian personnel who are training in crisis action planning and execution of contingency response operations.