SOUTH CHINA SEA - Members of a joint U.S. and Australian navy boarding team conduct a security sweep aboard USNS Walter S. Diehl (T-AO 193) Oct. 29, 2009, during a boarding exercise in the South China Sea as part of the Proliferation Security Initiative (PSI) exercise Deep Sabre II. Deep Sabre II is a multinational maritime interdiction exercise designed to enhance the capabilities and improve the coordination of participating countries, which also include Brunei Darussalam, Canada, France, Japan, New Zealand, the Philippines, South Korea, Russia and Singapore. (DoD photo by Mass Communication Specialist 2nd Class Seth Clarke, U.S. Navy/Released)