1. USA
2. China
3. Israel
4. Japan
5. South Korea
6. United Kingdom
7. France
8. Russia
9. Singapore
10. Germany
Honorable mentions, in no particular order, Australia, Poland, Finland, Taiwan, Switzerland.
Smaller countries with modern C2, organisation, doctrines, tactics, training and large enough reserves are better in the real world than some that look good on paper or in theory.