I want to know the answer to the following question:
On what date did Eisenhower leave active duty in the military?
All the background I'm provided with is that "The trustees of Columbia University refused to accept Eisenhower's resignation in December 1950, when he took an extended leave from the university to become the Supreme Commander of the North Atlantic Treaty Organization (NATO), and he was given operational command of NATO forces in Europe.". Is that enough to answer the question?