Marines with 1st Marine Logistics Group and Sailors with Naval Mobile Construction Battalion 5 attach a hose onto a 3D concrete printer during a 3D concrete printing exercise Dec. 12, at Camp Pendleton, California. Working with Marine Corps Systems Command’s Advanced Manufacturing Operations Cell and the Army Corps of Engineers, the 1st MLG used the Automated Construction of Expeditionary Structures—or ACES—printer to conduct 3D concrete printing of the bridge and evaluate emerging technology for future application in Marine Corps engineering operations. (U.S. Marine Corps photo by Lance Cpl. Betzabeth Y. Galvan)