Newport News Shipbuilding, a division of Huntington Ingalls Industries (HII), marked a major milestone this week in the refueling and complex overhaul (RCOH) of the Nimitz-class aircraft carrier USS Abraham Lincoln (CVN 72). The shipyard installed the final section of the ship's main mast: the 38-foot upper mast section. A brief mast-stepping ceremony was held Tuesday for Lincoln shipbuilders and the crew on the flight deck of the ship to commemorate the milestone. Mast-stepping ceremonies are a common tradition dating back to ancient Rome and symbolize good luck.