A milling machine is used to engrave the 31st Fighter Wing shield into a piece of metal at Aviano Air Base, Italy, Dec. 4, 2019. A milling machine is usually capable of cutting a wide variety of metals, ranging from aluminum to stainless steel. ( Air Force photo by Airman Thomas S. Keisler IV)

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Photo credit: © APFootage / Alamy / Afripics
License: Licensed
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Keywords: 31fw, 31mxs, aviano, metals, usaf, usafe, weld