The Navy is beginning to assess what would replace the Trident II D5 fleet ballistic missile because the Columbia-class submarine will outlast the munition, according to the service. Vice Adm. Terry Benedict, strategic systems program director, told Inside the Navy Feb. 15 after his presentation at an industry conference in Arlington, VA, that Navy acquisition chief Sean Stackley green lighted Benedict's office to begin an early conceptual phase on a fleet ballistic missile replacement. Stackley is currently serving as...