Air Force Staff Sgt. Sean Marlow, a survival, evasion, resistance and escape SERE specialist, performs a free-fall parachute jump from a UH-1N Iroquois helicopter above Fairchild Air Force Base, Wash., Dec. 5, 2011. Both static line and free-fall training courses are mandatory to become a SERE specialist. Airman 1st Class Taylor Curry

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Keywords: .., air, defense, force, military, united, war