Sergeant Major of the Marine Corps Sgt. Maj. Ronald L. Green, right, and Maj. Gen. Craig C. Crenshaw, commanding general of Marine Corps Logistics Command, ride in a 3D printed car at the Local Motors Microfactory, Knoxville, Tenn., April 25, 2017. Green and Crenshaw along with Commandant of the Marine Corps Gen. Robert B. Neller visited to better understand innovative co-creation and manufacturing.

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Photo credit: © Ted Small / Alamy / Afripics
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