150710-N-EH855-212 TIMOR SEA Aviation Ordnanceman 3rd Class Benjamin Davis, from Harrisburg, Pa., right, clears a .50-caliber machine gun during a live-fire exercise on the fantail of the Nimitz-class aircraft carrier USS George Washington as part of Talisman Sabre 2015. 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.