COLORADO SPRINGS — U.S. Air Force Space Command chief Gen. William Shelton is calling for a "cool down" period between U.S. officials and their Russian counterparts in the flap over the supply of Russian rocket engines for U.S. launches, but says he supports the development of a new, U.S.-made engine. Political volleys related to the crisis in Ukraine culminated last week with Russia’s deputy prime minister announcing an end to deliveries of RD-180 first-stage engines ...


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