150327-N-NI474-1066 WATERS NEAR GUAM U.S. Navy and Japan Maritime Self-Defense Force ships sail in formation during Multi-Sail 2015. Multi-Sail is an annual Destroyer Squadron 15 exercise designed to assess combat systems, improve teamwork and increase warfighting capabilities in the U.S. 7th Fleet area of responsibility. JMSDF is participating in Multi-Sail for the first time to improve interoperability and strengthen U.S.-Japan alliance.