Duty, Honor, Country
West Point is a leadership laboratory. Cadets learn leadership through research such as classroom discussion and case study reading and practical experience by acting in a leadership role and observing other lead. Sometimes the best lessons are when Cadets see failed leadership.
Robert E Lee was a great military strategist and tactician but he failed as a West Point leader. The two most important principals for a West Point Cadet are the honor code and oath of office which pledges support to the United States Constitution. By failing to honor his pledge to the US Constitution, Lee failed which, in my assessment of him as a leader, made all of his other efforts meaningless. As a leader, you can do many great things but, if you fail at the most important things, Duty, Honor and Country, then you should never be honored or respected.