NASA and Pentagon officials moved swiftly this past week to urge competitors to Elon Musk’s SpaceX to more quickly develop alternative rockets and spacecraft after President Donald Trump threatened to cancel Space X’s contracts and Musk’s defiant response.

Elon Musk said SpaceX would begin to decommission the company's Dragon spacecraft, a remark on X that came after Trump said the government should cancel contracts with Musk-connected companies. NASA r