Atlas-Centaur
The Atlas-Centaur was a US expendable launch vehicle derived from the SM-65 Atlas D missile. Convair, the manufacturer of the Atlas, developed the Centaur upper stage specifically for that booster, sharing its pressure stabilized tank structure. Centaur was the first rocket stage to utilize liquid hydrogen (LH2) and liquid oxygen (LOX) as propellants. Despite high performance, LH2 had to be chilled at extremely low temperatures (lower than LOX) and its low density meant that large fuel tanks were needed.
Missions: 68
Successes: 55
Partial Failures: 4
Failures: 9
Success Streak: 1
Success Rate: 83.8%