The cold war pushed the united states build an army ready to deploy anywhere around the globe at a moment's notice, shifting its foreign policy perspective away from to

I believe it's from  non-interventionist to interventionist.
During the cold war period, the Soviet Union tried to spread communism influences throughout the world by giving supplies and weapons to conflicted nations in order to gain an ally.
Because of this, united states believe that they need to start making intervention for global conflicts  to prevent communism from gaining dominant control in the world affairs. 

Ithink it was the jungle