Um.... not true. The Redstone rocket arrived from the US in peices and unmodified and was a part of an arsenal of 10 rockets donated for civil aerospace by the US Air force. Each rocket was heavily modified in accordance to the missions they were to be used for. They were modified for factors such as payload aerodynamics and weight, trajectory requirements, and expected heat.

The modifications were carried out by the Weapons Research Establishment (now a part of the Defence Science and Technology Organisation) in the Australian military at the Woomera testing facility with designs and testing from the University of Adelaide. These modifications were also made in conjuction with TRW Inc in a mostly supervisory role focussing double checking and materials testing (the now defunct aerospace manufacturer that helped with the US modifications of the Redstone rockets for their early satelites in the 50s-early 60s such as the mercury and jupiter missions).

The Redstone rocket was originally a ballistic missile for nukes and was developed by the US military with german rocket engineers. At this point in time the US rocket tech was mostly german tech. The redstone rockets were a itteratively improved from an original design that came out of Army Ballistic Missile Agency and was manufactured by Chrysler from 1952 to 1961.

So you are wrong. While it was a US designed rocket (like I said), it was modified for each civil space mission in accordance to the needs. A task that was done by the Australian aerospace industry in Australia...

EDIT: A source https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwip34eh_MD7AhVXBYgKHVk8BpIQFnoECFAQAQ&url=https%3A%2F%2Fwww.honeysucklecreek.net%2Fsupply%2FWRESAT%2FWRESAT_Images%2FWRESAT_booklet_Nov_1967.pdf&usg=AOvVaw1XPn5SDwlauNfZaDwr2xc-

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