14-0112-Z-YW189-017- Technical Sergeant Dan Gerlach, a structures supervisor with the 127th Civil Engineer Squadron, gives guidance to Airman 1st Class Andrew Mapley, a structural journeyman in the 127th CES during training on building trusses at Selfridge Air National Guard Base, Mich., January 12,2013. A truss is a support to strengthen a roof, bridge, or other elevated structure with a network of beams and bars. (U.S. Air National Guard photo by Staff Sgt. Samara Taylor/Released)
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