The US Department of Defense has stated that the United States Air Force (USAF) must ensure its computers are operating Windows 10 by March 31, 2018. The Microsoft OS is considered to be a crucial component in the overall readiness of the armed service branch.
https://www.notebookcheck.net/Windows-10-vital-to-US-Air-Force-preparedness.284484.0.html
What about the Windows 10 data collection "feature"? Or it's excluded for the AF? ;D