Article: He assumed duties again at Camp Meade, Maryland, commanding a battalion of tanks, where he remained until 1922. His schooling continued, focused on the nature of the next war and the role of the tank in it. His new expertise in tank warfare was strengthened by a close collaboration with George S. Patton, Sereno E. Brett, and other senior tank leaders. Their leading-edge ideas of speed-oriented offensive tank warfare were strongly discouraged by superiors, who considered the new approach too radical and preferred to continue using tanks in a strictly supportive role for the infantry. Eisenhower was even threatened with court martial for continued publication of these proposed methods of tank deployment, and he relented.

Now answer this question: When did Eisenhower leave Camp Meade?
1922