150323-N-NI474-491 WATERS NEAR GUAM A Mark-15 Phalanx close-in weapon system fires from the Arleigh Burke-class guided-missile destroyer USS Michael Murphy 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.