Ten billion sounds like a lot, but it's not really for an organization like the DoD that has so many projects and so much money. I bet someone above you assessed the risks and decided your project was good to run for as long as it could, but wouldn't be a crippling loss if it had to shut down. It would be like Google having to decide to keep selling Chromecasts until they can't and just stopping, or buying up the entire supply chain to secure their ability to produce Chromecasts indefinitely.