Staff Sgt. Lawanda Perthel, 28th Civil Engineer Squadron project instructor, uses a total station and prism apparatus to survey a construction site with Staff Sgt. Reuben Gingerich, 28th CES engineer technician, at Ellsworth Air Force Base, S.D., Oct. 23, 2014. The equipment sends out a radar signal, bounces off the prism and provides engineers with the distance and angle of the site. (U.S. Air Force photo by Senior Airman Hailey R. Staker/Released)
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