Rostow began his career as an advisor to John F. Kennedy. His book, Stages of Economic Growth, provided the intellectual framework that undergirded the US intervention in Vietnam. As the 3d World emerged as free nations, they will modernize their traditional economies. This modernization process will cause social dislocation. For example, peasants will move from the rice fields to the cities in quest for high paying jobs.
Dislocation breeds uncertainty.
Dislocation will disrupt traditional life. Communists will try to capitalize on this uncertainty to overthrow wobbly governments. US must protect newly emerging economies in the 3rd World with military force. Military over Civilian. The military was the key to modernizztion.