It's had downstream benefits in the hardware, IoT, cybersecurity, devops, missle research, and aerospace segments just off the top of my head. I don't want to dox myself but a lot of GovCloud can be attributed to the F35 development cycle.
Interesting, I haven't looked into GovCloud before. While it seems weird that the US government would entrust their data with AWS, it's probably a lot better than their antiquated systems.