SpaceX CEO Elon Musk's security clearance doesn't grant him complete access to the company's classified work with the US government.Musk isn't allowed to enter SpaceX facilities where classified information is being deliberated upon.He also isn't privy to the classified cargo SpaceX launches into space as part of the company's contracts with US national security agencies.Musk obtained his top-secret clearance in 2022, following a review process that took years.