Off the coast of the Korean Peninsula, U.S. and South Korean Navy ships prepared for an event they hope will never happen: a North Korean land and air attack against their neighbors to the south.
The annual bilateral training exercise called Maritime Counter Special Operations Force involved a U.S. aircraft carrier, the USS Ronald Reagan and a U.S. destroyer, the USS Stethem, as well as South Korean ships.
ABC News' Martha Raddatz was aboard the Reagan in the Sea of Japan for the exercise this week, as the Trump administration grapples with an increasingly hostile and technologically advanced North Korea.
Rear Adm. Marc Dalton, commander of Navy's carrier strike group in the Pacific, said the U.S. commitment to defending itself and its allies is "enduring."
"This exercise is an example of how we train with our allies in order to be ready to respond to a range of crises," he said.
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