Microsoft’s (MSFT) business dealings with the US military just became a whole lot more lucrative. On Wednesday, it was reported that the tech giant has won a contract to supply the US army with augmented reality headsets based on the company’s HoloLens product. The deal for 120,000 headsets is purportedly worth up to $21.9 billion over 10 years. In a blog post, Microsoft has said the project is now transitioning to production from its prototyping phase. The AR system will let soldiers share information and decision-making and provide a safer and more effective operating environment. J.P. Morgan’s Mark Murphy is “very surprised by the potential magnitude of the contract.