U.S. Marines with 7th Engineer Support Battalion, 1st Marine Logistics Group, work together to secure a concrete bridge support column during 7th ESB’s 3D Concrete Printing exercise at Camp Pendleton, Calif., Dec. 12, 2018. 7th ESB’s mission was to utilize the Automated Construction of Expeditionary Structures (ACES) Printer to conduct 3D concrete printing and evaluate emerging technology for future application in Marine Corps engineering operations. (U.S. Marine Corps photo by Cpl. Robert Bliss)