Need to be careful with the German. Aggregat in that context was a group or type of machines. The V-2 was the fourth in the evolution of the series. The Wermacht called it the A-4 in their correspondence, while the Party used V-2. Same was true of the Fiesler Fi-103 flying bomb

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Gravity is a harsh mistress
SAM 002
NAR 91005
"The complexity of living is eminently favored to the simplicity of not."