Who would have guessed! The NSA sure has a thing for Windows 10 and the Surface line of devices, as it recently gave its approval and cleared them both for classified use.
National Security Agency had been reviewing not just the operating system, but also machines like the Surface Pro 3, Surface Pro 4 and the Surface Book for use in its Solutions for Classified Programs list, making the Surface line of devices the only Windows 10 hardware currently on the list.
This is a big win for Microsoft, as it now means that the company can sign contracts with government agencies and implement solutions centered on both these products.
source:windows10update