Jets taking off formation flight

The video discusses the growth and increasing efficiency of the US Air Force, highlighting its potential to become a formidable deterrent against potential enemies. As the Air Force reaches its goals, it is expected to serve as a strong guarantee of national security and contribute to global peace by making war too costly for aggressors.

What does the phrase 'making War Two costly for any aggressor' imply about military strategy?

In what way could America's air power serve as a guarantee for national security and world peace?