Airman 1st Class Brian Frazier, 28th Civil Engineer Squadron pavements and construction heavy equipment operator, tightens a bushing to fasten a fiber glass mat to a splice at Ellsworth Air Force Base, S.D., Sept. 30, 2015. During the exercise, Airmen connected two fiber glass mats together using a splice so the mat would be large enough to cover the simulated crater. (U.S. Air Force photo by Airman Sadie Colbert/Released)