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If China or Russia blew up U.S. satellites, it could cripple critical infrastructure, such as GPS navigation and the debris could litter valuable orbits, perhaps leaving them unusable.
"When people like to question the validity or usefulness of this engine, I point them to Wernher von Braun," said Tabitha Dodson, DRACO program manager at DARPA, "because this was more or less his idea."