Ukrainian soldiers prepare a U.S.-supplied M777 howitzer to fire at Russian positions in Kherson region, Ukraine, Jan. 9, 2023. A rapidly expanding group of U.S. and allied troops and contractors are using phones and tablets to communicate in encrypted chat rooms to provide real-time maintenance advice to Ukrainian troops on the battlefield. As the U.S. and other allies provide a growing number of increasingly complex and high-tech weapons, the maintenance demands are expanding. (AP Photo/Libkos, File)
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