Lieutenant Commander Carrol McKenzie from Montana, U.S., the Executive Officer of USS Harpers Ferry, uses binocular during an operation on the Harpers Ferry off Baengnyeongdo, an island near the maritime border with North Korea, northwest of Seoul April 5, 2010. A group of U.S. navy vessels are near the site where the South Korean Navy corvette Cheonan sank on March 26 to help with search and recovery operations as South Korean navy conducts the recovery effort. REUTERS/Lee Jae-Won (SOUTH KOREA - Tags: MILITARY POLITICS DISASTER)