A M1A1 Abrams tank navigates on various types of matting systems developed by U.S. Army's Engineer Research and Development Center (ERDC) during a demonstration of methods used by military vehicles during amphibious operations at the Vicksburg, Miss. campus, Aug. 1, 2017. U.S. officials say that Abrams tanks needed to train Ukrainian forces have arrived in Germany, and are on their way to Grafenwoehr Army base where the training will begin in two to three weeks. (Courtland Wells/The Vicksburg Post via AP) **FILE**
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