A U.S. Army soldier works on a M1A2 tank during a military exercise in Paju, South Korea, near the border with North Korea, on April 21.
A U.S. Army soldier works on a M1A2 tank during a military exercise in Paju, South Korea, near the border with North Korea, on April 21. Ahn Young-joon The Associated Press
A U.S. Army soldier works on a M1A2 tank during a military exercise in Paju, South Korea, near the border with North Korea, on April 21. Ahn Young-joon The Associated Press