MEDITERRANEAN SEA — Interior Communications Electrician Fireman Sean Ondayko, from West Lafayette, practices chest compressions during a CPR class aboard the Arleigh Burke-class guided-missile destroyer USS Donald Cook (DDG 75) on May 2. Donald Cook, forward-deployed to Rota, Spain, is on its seventh patrol in the U.S. 6th Fleet area of operations in support of regional allies and partners, and U.S. national security interests in Europe and Africa. (U.S. Navy photo by Mass Communication Specialist 2nd Class Alyssa Weeks / Released)