Guided-missile destroyer USS O'Kane (DDG 77) operates along with other Navy ships during exercise Koa Kai 14-1 in waters near Hawaii. Koa Kai is a semiannual exercise that improves cooperation, readiness and the capability of forces to respond quickly to various crises, ranging from armed conflict to humanitarian assistance. (U.S. Navy photo by Mass Communication Specialist 1st Class Daniel Barker/Released)