Air Force Staff Sgt. Nicholas Machado, 345th Training Squadron parachute rigger instructor, Ft. Lee, Va., talks to Airman on proper techniques of knot tying, 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: 37trw, jbsa-lackland, showcase