US Department of Defense to standardize Windows 10 for over 4 million seats
Thursday, February 18, 2016 at 3:31PM 
Microsoft and Windows 10 got a great vote of confidence today from the US Department of Defense which plans to standardize the OS across 4 million seats.
According to the Office of the DoD CIO the Secretary of Defense has directed all U.S. DoD agencies to begin the rapid deployment of the Microsoft Windows 10 throughout their respective organizations for information systems currently utilizing Microsoft Operating Systems. From laptops to desktops to mobile devices, including Surface devices, the DoD is targeting its Windows 10 upgrade for completion in a year, an unprecedented move for a customer with the size and complexity of the DoD.
the DoD will be the single largest enterprise deployment of Windows 10 to date. Head on over to the Windows blog for more details.
Source: Microsoft