Delta (rocket Family)
Delta is a versatile family of expendable launch systems that has provided space launch capability in the United States since 1960. There have been more than 300 Delta rockets launched, with a 95 percent success rate. Two Delta launch systems – Delta II and Delta IV – are in active use. Delta rockets are currently manufactured and launched by the United Launch Alliance.
Other articles related to "delta":
... Currently development is focused human-rating the DeltaIV Heavy,which uses three Common Booster Cores to lift higher masses to orbit and escape velocity ...