Army UH-60 Black Hawks from the 25th Combat Aviation Brigade (25th CAB) prepare to launch during exercise Koa Kai. Koa Kai is a semiannual exercise in the waters surrounding the Hawaiian islands designed to prepare independent deployers in multiple warfare areas and provide training in a multi-ship environment. (U.S. Navy Photo by Mass Communication Specialist 2nd Class Mathew J. Diendorf/Released)