151117-N-DM308-738 ATLANTIC OCEAN (Nov. 17, 2015) Sailors assigned to the "Black Knights" of Helicopter Sea Combat Squadron (HSC) 4) prepare to chain down a MH-60S Sea Hawk helicopter to the flight deck of the aircraft carrier USS George Washington (CVN 73). Washington was participating in UNITAS 2015. UNITAS, the U.S. Navy's longest running annual multinational maritime exercise, is part of the Southern Seas deployment planned by U.S. Naval Forces Southern Command/U.S. 4th Fleet. This iteration of UNITAS is conducted in two phases: UNITAS PACIFIC, hosted by Chile in October 2015 and UNITAS Atlantic hosted by Brazil in Nov.. (U.S. Navy photo by Mass Communication Specialist 3rd Class Paul Archer/Released)