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Master Sgt. Carlos Gill, the non-commissioned officer in charge of metals technology for the 149th Fighter Wing, instructs fellow Gunfighters on 3D printing techniques at the 149th FW “3D Printing Center of Excellence” on Joint Base San Antonio-Lackland, Texas, 12 Dec. 2021. (U.S. Air National Guard Photo by Staff Sgt. Katie Schultz)
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