Something that isn't well covered is the rocket motor supply chain. Prior to SpaceX there hadn't been a US manufacturer for heavy lift booster engines since th

Something that isn't well covered is the rocket motor supply chain. Prior to SpaceX there hadn't been a US manufacturer for heavy lift booster engines since the 90s. Undoubtedly SpaceX is the recipient of DoD funds to build that supply chain and research pipeline for both missile and lifting purposes.