As military professionals charged with the defense of the Nation, joint leaders must be true experts in the conduct of war. They must be individuals both of action and of intellect, skilled at "getting things done," while at the same time conversant in warfare. Every joint leader is expected to have a solid foundation in military theory and philosophy. Most have or should have studied Sun Tzu, Thucydides, Antoine-Henri Jomini, and Carl von Clausewitz. However, when asked, most would give differing definitions of war and warfare. The upcoming Joint Publication (JP) 1, Doctrine for the Armed Forces of the United States, will define war and warfare.