U.S. Navy Master At Arms 3rd Class Brandon Marshall assigned to Maritime Expeditionary Security Squadron (MSRON) 7, exits the Gab Gab Beach pool after completing a swimming exercise during Monster Mash at Naval Base Guam Apara Harbor, Guam, Jan. 15, 2010. Every quarter, Sailors with MSRON-7 complete a Monster Mash exercise, a course designed to demonstrate both core skills and physical strength.