The military can afford to pay for Patches from MS, while:
1. You are not military
2. You are broke and cannot afford the monthly payments MS charges
3. The cost of those monthly charges are worth 2 licenses of Windows 10 Pro
4. You don't have the technical skill of the military to use on your...
Because new vulnerabilities are discovered every day and people who create malware don't sleep. That's why you need frequent security updates which Windows 7 now lacks