Air Force Senior Airman David Petrich, 374th Maintenance Squadron aircraft metals technology journeyman, showcases the tungsten carbide used in metals technology to Koku Jietai Cadets at a Basic Maintenance Officer Tour at Yokota Air Base, Japan, Feb. 1, 2018. Tungsten Carbide is a diamond hard substance used to cut metals into any required shape needed to repair aircraft. ( Air Force

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