Those U.S. ships “would be in a good position to engage medium-range ballistic missiles going into the Sea of Japan, which is where the previous North Korean test shots have gone,” said Bryan Clark, a naval analyst with the Washington-based Center for Strategic and Budgetary Assessments, who previously served as a special assistant to the Chief of Naval Operations. That presence off of Japan means that “when the Vinson gets there, it will not need to bring additional BMD capability,” Clark added, referring to ballistic missile defense.