Is Military Force Becoming Less Useful as an Instrument of Policy?

Military force has, throughout history always been a vital component that States have used as an instrument to help shape policy. It was genuinely accepted that a country's size, power and influence within the realm of international politics was largely dependant upon the military force with which a country could muster.
There are two schools of thought on the use of force; the Complex Interdependence theory, which argues that military force is becoming an obsolete means of shaping policy and the Realists who believe that military force is still an important instrument of state policy. …