US Navy (USN) Sailors watch as an Amphibious Assault Vehicle (AAV) from the 31st Marine Expeditionary Unit (31st MEU) enter the well deck of their ship, the USN Dock Landing Ship USS HARPERS FERRY (LSD 49), during the annual EXERCISE COBRA GOLD 2006 in the Gulf of Thailand (THA). This year is the 25th anniversary of COBRA GOLD, a combined annual joint training exercise aimed at developing interoperability, strengthening relationships between services and developing cross-cultural understanding among participating nations