170507-N-TC437-579 PACIFIC OCEAN (May 7, 2017) The Ticonderoga-class guided-missile cruiser USS Bunker Hill (CG 52) fires it's Mark 45 5-inch gun during an air defense exercise while conducting a group sail training unit exercise. Group sail is a pre-deployment underway which allows the Theodore Roosevelt Carrier Strike Group to conduct exercises together in a maritime environment. (U.S. Navy photo by Mass Communication Specialist 2nd Class Ignacio D. Perez/Released)