Final Flight: What made ULA's Delta IV Heavy stand apart from other rockets?
The size and power of the ULA Delta IV Heavy rocket Unlike the regular Delta IV medium, Delta IV Heavy has three Delta IV ...
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ULA sets date for final rocket flight of ‘the dependable Delta’
including the Delta IV Medium, a single-booster vehicle that launched for the 29th and final time in 2019. The Delta IV Heavy — and also the Atlas V — is being replaced by ULA’s Vulcan ...