The general purpose of the military science is to make clear how to win war. The historical root of the military science is the book that was written by Carl von Clausewitz who was a soldier in the Prussian army in the 19th century. In this book, Clausewitz made a discovery that war is an instrument for political act not only a violent action. Clausewitz suggested the relation between policy and war, and made it easy to define the being of the war as the means to enforce our will to the others with physical forces. This realistic view of the war that the political power controls military operations is meeting to the military science. The problem for military scientists is to study how to operate military actions.