Builder Construction man Ida Grigson, wearing water filled Camel Back, from the Navy Mobile Construction Battalion One (NMCB1) paints sections of the bridge frame before her co-workers lay down new wood planking. The bridge needed repair before field exercises started during Exercise TANDEM THRUST. TANDEM THRUST is a combined United States, Australian, and Canadian military training exercise. This biannual exercise is being held in the vicinity of Shoalwater Bay training area, Queensland, Australia