U.S. Marine Cpl. Samuel G. Potenti (middle) and Lance

U.S. Marine Cpl. Samuel G. Potenti (middle) and Lance Cpl. Pedros A. Hernandez (right), both mortarmen with 2nd Battalion, 7th Marine Regiment, the 31st Marine Expeditionary Unit's battalion landing team, are teaching Royal Australian Army Gunner Dean Lofts about the M249 squad automatic weapon during Talisman Sabre 2011 on Townshend Island, Australia, July 12. Talisman Sabre promotes the alliance with Australia, which is one the United States' most important defense relationships and a central pillar for national security strategy, based on shared values and a common commitment to peace and security.