170809-N-KP948-187 MEDITERRANEAN SEA (Aug. 9, 2017) Gunner's Mate 2nd Class Zacarias Delacruz fires a .50-caliber machine gun as Gunner's Mate 2nd Class Caleb Samples serves as the safety observer aboard the Arleigh Burke-class guided-missile destroyer USS Oscar Austin (DDG 79) during exercise Reliant Mermaid 2017. The maritime search and rescue and force protection exercise is designed to increase interoperability by developing individual and collective maritime proficiencies of participating nations, as well as promote friendship, mutual understanding and cooperation. (U.S. Navy photo by Mass Communication Specialist 3rd Class Alyssa Weeks/Released)