The worried reaction within space and national security agencies highlights the risks of government’s exclusive dependence on SpaceX for crucial tasks, including classified missions.

Elon Musk's threat, which he later retracted, to cut off NASA's use of SpaceX's Dragon spacecraft would be a huge blow to NASA, depriving the space agency of the only American vehicle capable of transporting astronauts to the International Space Station and dramatically changing how NASA would access the $100 billion orbiting laboratory,