Amid heightened tensions with North Korea, US Navy prepares to defend allies More ABC News' Martha Raddatz went on board the USS Ronald Reagan aircraft carrier to witness the US Navy's bilateral training exercise with South Korea. The annual exercise ensures that South Korea could be defended from an attack by their North Korean neighb Coming up in the next {{countdown}} {{countdownlbl}} Coming up next: {{nextVideo.title}} {{nextVideo.description}} Skip to this video now Related Related Extras Related Videos Video Transcript Transcript for Amid heightened tensions with North Korea, US Navy prepares to defend allies -- This transcript has been automatically generated and may not be 100% accurate. Now Playing: {{itm.title}}

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