Marines perform a live fire exercise with the M-198 155 mm howitzer in the Shoalwater Bay Training Area, Queensland, Australia during Exercise Tandem Thrust 2001 on May 26, 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. The Marines are from the 1st Battalion, 12th Marines, deployed from Kaneohe Bay, Hawaii.