But single-sourcing your cloud destroys any remaining value proposition: If you become dependent on a single cloud provider's services, they can charge you as much as they want once the current contract is up, and your lock-in means you're going to end up paying it. (Or we all are, since it's the DOD and we pay taxes.) The ten billion dollar contract is nice to have now, but I'm sure Microsoft and Amazon are both really licking their lips for the forty billion dollar renewal ten years later.