U.S. And South Korea Operate Anti-Submarine Exercise

EAST SEA - JULY 26: (EDITORS NOTE: Image has been reviewed by U.S. Military prior to transmission.) In this handout image provided by the U.S. Navy, the Los Angeles-class attack submarine USS Tuscon (SSN 770) transits the East Sea Monday, July 26, 2010 while leading a 13-ship formation. The United States and South Korea are conducting the combined alliance maritime and air readiness exercise "Invincible Spirit" in the seas east of the Korean peninsula from July 25-28, 2010. This is the first in a series of joint military exercises that will occur over the coming months in the East and West Seas. The exercise, the first joint drill after the sinking of the South Korean corvette Cheonan in March 2010, has drawn condemnation from Pyongyang, North Korea. (Photo by Mass Communication Specialist 3rd Class Adam K. Thomas/U.S. Navy via Getty Images)