A South Korean tugboat assists USS Nimitz's mooring efforts as the nuclear-powered aircraft carrier arrives in Busan Naval Base for a port call Feb. 28. Nimitz is in the Republic of Korea, taking part in Exercise Key Resolve/Foal Eagle 2008, an annual combined/joint exercise involving forces from both the U.S. and the ROK. This exercise provides training to further enhance interoperability and combat readiness, while also demonstrating both countries' commitment to the ROK/US alliance.