NRL's Vanguard

• Bad rep - but stage 2 and 3 used for Delta with success

• Early launches used 2 kg test satellite - success on 3rd try

• Standard “Vanguard sphere” was 51cm - 2 of 8 made orbit

• Some of the Vanguard team went to Goddard to do science satellites, but some stayed at NRL

• Now we know: the Vanguard 51-cm sphere satellite had a later, secret history