Asymmetry and U.S. Military Strategy: Definition, Background, and Strategic Concepts
Dr Douglas V Johnson II, Dr Steven Metz
Book by the US Army War College, Strategic Studies Institute:
"In war, there are always differences between the opponents. At times these are insignificant, passing disparities with no bearing on the outcome. At other times, the differences between opponents are important, placing one in a position of advantage, the other at a disadvantage. This is a very simple observation, but from it flows one of the pressing issues faced by the United States today: strategic asymmetry."