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3D Concrete Printing Exercise
Marines with 7th Engineer Support Battalion and Sailors with Naval Mobile Construction Battalion 5 attach hose onto 3D concrete printer during 3D Concrete Printing exercise at Camp Pendleton, California, December 9, 2018 (U.S. Marine Corps/Betzabeth Y. Galvan)

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Photo by: Lance Cpl. Betzabeth Galvan |  VIRIN: 181209-M-ZD670-074.JPG