U.S. Marines with Echo Company, 2nd Battalion 4th Marines, Battalion Landing Team assigned to the 31st Marine Expeditionary Unit, secure the parameter of their base during a simulated attack for exercise Talisman Saber 13, Sam Hill, Shoal Water Bay Training Area, Queensland, Australia, July 23, 2013. Talisman Saber is a bilateral training exercise that the 31st MEU and the Australian Royal Military undergo every two years to improve interoperability and common relations between the two allied nations. (U.S. Marine Corps photo by Michael S. Oxton/Released)