The second of two Northrop Grumman-manufactured aft exit cones to arrive for the Space Launch System’s solid rocket boosters is moved by crane inside the Rotation, Processing and Surge Facility at NASA’s Kennedy Space Center in Florida on Dec. 9, 2019. Both aft exit cone were shipped from Promontory, Utah. The left aft exit cone is in view in the background. They will be checked out and prepared for the Artemis I uncrewed test flight. The aft exit cones sit at the bottommost part of the twin boosters. The cones help provide added thrust for the boosters, while protecting the aft skirts from the thermal environment during launch.