Russia's most active launch vehicle, the 1-million-lb.-thrust SL-4 ``Soyuz,'' has failed twice in a row, slowing Russian military reconnaissance operations and jeopardizing the schedule for resupply of the Mir space station. The failures June 20 and May 14, both during the launch of military imaging satellites, have raised concerns about quality control on the 163-ft.-tall vehicle and the potential for impact to Mir station operations. The accidents have also sparked criticism ...

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