190222-N-HQ322-0385 PASCAGOULA, Miss. (Feb. 22, 2019) Cmdr. Robby Trotter, left, commanding officer of the guided-missile destroyer USS Paul Ignatius (DDG 117), signs the DD250 document officially delivering Paul Ignatius to the U.S. Navy. The DDG-51 class ships currently being constructed are Aegis Baseline 9 Integrated Air and Missile Defense destroyers with increased computing power and radar upgrades that improve detection and reaction capabilities against modern air warfare and Ballistic Missile Defense threats. (U.S. Navy photo by Gunner's Mate 2nd Class Erin Bullock/Released)