Crew members of the U.S. Navy's USS George Washington aircraft carrier stand beside an F/A-18 Hornet fighter jet during joint military drills between the U.S. and South Korea in the West Sea November 29, 2010. The U.S. and South Korean militaries started a massive drill on Sunday. South Korean President Lee Myung-Bak said he felt responsibility for failing to protect citizens from North Korea's shelling last week and warned the North against further provocations.  REUTERS