INVINCIBLE SPIRIT The attack submarine USS Tuscon sails through the East Sea, July 26, 2010, while leading a 13-ship formation participating in the combined alliance maritime and air readiness exercise "Invincible Spirit." The United States and South Korea are conducting the exercise 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. SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 374739-K-UQE76-147.jpg Photo Gallery