If you are counting the current "Global War on Terrorism" as WW3, then the US is leading that fight.
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The United States of America for the first 3 years.
Anywhere away from America and north Korea
Look at Woodrow Wilson's Fourteen Points. Specifically numbers 2 and 3.
The Allied Powers,or Great Britian,France,and the U.S.
WWII thru Vietnam was 5 tanks per platoon. 3 tanks led by the LT was the heavy section, 2 tanks led by the platoon sergeant was the light section. After Vietnam, everything changed.