Prepping for joint naval drill in Busan . FEBRUARY 04, 2013 05:32. . South Korean and U.S. naval vessels on Sunday undergo check-ups at a naval base in Busan before participating in a bilateral exercise to be held in the East Sea Monday through Wednesday. On the left is South Korea’s Aegis-class destroyer King Sejong while on the right is the USS Shiloh, a U.S. Aegis cruiser.