GRISSOM AIR RESERVE BASE, Ind -- Staff Sgt. Antonio Acevedo, an engineering apprentice with the 434th Civil Engineering Squadron, ensures his geodimeter is leveled. The geodimeter helps CES establish the elevation of other points based off a known point. The geodimeter sends a laser to target areas that are made up of prisms set on tripods. The geodimeter sends a laser shot to the prism which is then bounced off the prism back to the geodimeter, where it is calculated. (U.S. Air Force photo/ SrA. Roberto Modelo)
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