FILE - A launch truck fires the High Mobility Artillery Rocket System (HIMARS) at its intended target during the African Lion military exercise in Grier Labouihi complex, southern Morocco, on June 9, 2021. U.S. leaders from President Joe Biden on down are being careful not to declare a premature victory, after a Ukrainian offensive forced Russian troops into a messy retreat in the north. Lawmakers particularly pointed to the precision weapons and rocket systems that the U.S. and Western nations have provided to Ukraine as key to the dramatic shift in momentum, including the precision-guided HIMARS. (AP Photo/Mosa'ab Elshamy, File)