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ROCKHAMPTON, Australia (July 10, 2015) - Lt. Guy Williams (left), a nursing officer and Pvt. Jessica Edwards (right), an advanced medical technician, both with 1st Close Health Battalion in the Australian army, give simulated medical treatment to U.S. Army Capt. Omar Alens, a liaison officer with 6th Squadron, 17th Cavalry Regiment. Talisman Sabre is a biennial exercise that provides an invaluable opportunity for nearly 30,000 U.S. and Australian defense forces to conduct operations in a combined, joint and interagency environment that will increase both countries' ability to plan and execute a full range of operations from combat missions to humanitarian assistance efforts.