Air Force Tech. Sgt. George Callaway, 343rd Training Squadron, Ft. Leonard Wood, Mo., heavy weapons instructor, explains the operational features of the MK19 40mm machine gun, May 14, 2021, Joint Base San Antonio-Lackland, Texas.

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Photo credit: © Operation 2021 / Alamy / Afripics
License: Licensed
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Keywords: 37th, jbsa-lackland, showcase, trw