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October 25, 2017 - San Diego, California, U.S. - This entry is built by Caddell Construction Co., (DE) LLC, of Montgomery Alabama and is made from material other than concrete. The six contractors constructing eight prototype border wall sections on Otay Mesa have finished their entries in the competition to build President Trump's border wall. The entries will sit for 30 days then be evaluated as to their effectiveness. (Credit Image: © John Gibbins/zReportage.com via ZUMA Wire)