The U.S. military is a dominant fighting force, capable of rapid global power projection and able to defeat state adversaries quickly and at relatively low cost in American lives and treasure. Unfortunately, American leaders are increasingly trying to transform this force into one optimized for counterinsurgency missions and long-term military occupations. A fundamental problem with the adoption of population-centric counterinsurgency (COIN) doctrine as an organizing principle for American military operations is that it systematically fails to take advantage of the real strengths of the U.S. military.
http://www.armedforcesjournal.com/2010/02/4387134