ULA Conducts Second Vulcan Practice Countdown

United Launch Alliance Vulcan-Centaur
Credit: United Launch Alliance
United Launch Alliance (ULA) conducted a practice launch countdown, including fueling, of its new Vulcan-Centaur rocket on Dec. 12, four days after the first so-called wet dress rehearsal (WDR) revealed problems with ground support equipment. During the Dec. 8 WDR, some of the fittings did not seal...

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