Air Force Staff Sgt. William Hierholzer, a Combat Leadership Course instructor, self rescues during the rappel masters certification course Nov. 5, 2010, at Camp Bullis, Texas. Individuals attending the five day rappel course learn how to tie 13 different knots, how to self rescue if stuck and how to descend down a wall and free side safely. Staff Sgt. Jonathan Snyder

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Keywords: .., air, airmen, antonio, defense, force, forces, master, military, rappel, rappelling, san, security, texas, united, usa, war