 This led to the replacement of the Blue Streak by the French-built Diamant section.However, confidence in the programme had diminished due to the poor reliability figures, and this led to its termination.While Europa was ultimately cancelled, the ambition for such a launcher was still present and supported by the majority of ELDO members and, following its reformation into the ESA in 1974, the agency proceeded to develop the Ariane family of launchers, would which prove to be a commercial success with hundreds of launches performed.