An MH-60S Knighthawk, assigned to the "Blackjacks" of Helicopter Sea Combat Squadron 21, maneuvers between the fast-combat support ship USNS Rainier (T-AOE 7) and the aircraft carrier USS Ronald Reagan (CVN 76) during a replenishment at sea. The Knighthawk is used for logistics support, vertical replenishment, search and rescue and naval special warfare support. Ronald Reagan is currently deployed to the U.S. 5th Fleet area of responsibility. Operations in the U.S. 5th Fleet are focused on reassuring regional partners of the United States' commitment to security, which promotes stability and global prosperity.