Editing Jupiter-C (section)

==Encrypted serial number==
The Jupiter-C was part of the [[Intermediate-range ballistic missile|IRBM]] project, and the sequence of manufacture of the rockets (which are not necessarily launched in order, and may be uprated as solutions to technical problems are worked out in tests) was considered a military secret. So the designation painted on the sides of the rocket was not a serial number in [[clear text]], but employed a simple transformation cypher that the staff would be sure not to forget. The key was taken from the name of the design and test base: [[Huntsville, Alabama]], giving HUNTSVILE, with duplicated letters dropped: H was used for 1, U for 2, ..., E for 9 and X for 0. For example, the Jupiter-C / Juno I modified to launch [[Explorer 1]] had "UE" painted on the side, indicating it was S/N 29 (U→2, E→9).<ref>{{Cite web|url=http://www.spaceline.org/rocketsum/jupiter-c.html|title=Rockets and Missiles / Jupiter C Fact Sheet|website=www.spaceline.org|access-date=2018-04-19}}</ref><ref>{{Cite web|url=https://history.nasa.gov/SP-4402/ch1.htm|title=SP-4402 Origins of NASA Names|website=history.nasa.gov|access-date=2018-12-26}}</ref>