In April 1994, the Army War College's Strategic Studies Institute held its annual Strategy Conference. The theme for this year's conference was "The Revolution in Military Affairs: Defining an Army for the 21st Century." Sir Michael and Professor Guilmartin are historians who have experienced warfare; indeed, have distinguished themselves in combat. Sir Michael Howard served in the Coldstream Guards in Italy in the Second World War. Dr. Guilmartin served two tours as a U.S. Air Force rescue helicopter pilot in Vietnam. Their personal experience with warfare is expressed eloquently in the following pages as they make the point that war is, as Carl von Clausewitz defined it nearly 200 years ago, a distinctly human endeavor. Because the Revolution in Military Affairs makes warfare all the more complex and changeable, one would be well advised to heed another of Clausewitz's admonitions, "The use of force is in no way incompatible with the simultaneous use of the intellect."