Airman 1st Class Karla Jiminez and Staff Sgt. Shawn Cullen, both from the 49th Civil Engineer Squadron, use a Tirfor and cable assemblies to pull fabric into position on a BEAR Base dome shelter as a part of the Structural Contingency Course at Holloman Air Force Base, N.M. June 3. Meanwhile, another student uses a Purlin installation tube to guide the fabric over the roof frame of the shelter and ensure it does not get caught. (U.S. Air Force photo/Airman Sondra M. Wieseler)

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