Headquartered in Paris, the founding members of the ELDO were Belgium, France, the United Kingdom, Italy, the Netherlands and West Germany; while Australia, Spain, Switzerland, Norway, and Sweden had chosen to decline participation. The ELDO not only served the purpose of harnessing Blue Streak, but also fulfilled ambitions to produce a European rival to the American and Soviet launchers being developed and deployed at that time. In response to the rise of the ELDO initiative, work on the competing Black Prince launcher gradually came to a halt as attention from the British government drifted towards European collaboration.