The sage continues.
AWS is the only bidder with the required capability.
Every major legacy government contractor has called in every political favor, and done everything imaginable to kill the contract.
Failing that, they want a second vendor. It doesn't matter that no other vendor has a functional cloud offering. In fact that's a feature. They want to trip up deployment of cloud applications by requiring any approved application to run on both clouds... when that second implementation is ready in 'soonish' e.g. 2029.