General of the Armies John Joseph Pershing GCB (September 13, 1860 – July 15, 1948), nicknamed "Black Jack", was a senior United States Army officer. He served most famously as the commander of the American Expeditionary Forces (AEF) on the Western Front during World War I, from 1917 to 1918. In addition to leading the AEF to victory in World War I, Pershing notably served as a mentor to many in the generation of generals who led the United States Army during World War II, including George C. Marshall, Dwight D. Eisenhower, Omar Bradley, Lesley J. McNair, George S. Patton and Douglas MacArthur.