USS Tuscon, US Navy Photogrpah

The Los Angeles-class attack submarine USS Tuscon transits the East Sea while leading a 13-ship formation. The Republic of Korea and the United States are conducting the combined alliance maritime and air readiness exercise "Invincible Spirit" in the seas east of the Korean peninsula from, July 25-28. This is the first in a series of joint military exercises that will occur over the coming months in the East and West Seas.