General of the Armies in the context of "Five-star rank"

Reichsmarschall (German: Reichsmarschall des Großdeutschen Reiches; lit. 'Reich Marshal of the Greater German Reich') was an honorary military rank, specially created for Hermann Göring during World War II, and the de jure highest rank in the Wehrmacht. It was senior to the rank of Generalfeldmarschall (lit. 'general field marshal', equivalent to field marshal, which was previously the highest rank in the Wehrmacht), but was merely a ceremonial appointment to accentuate Göring's position as Hitler's designated successor. No actual subordination of the other field marshals or a superior position of the holder followed from it. It was equivalent to General of the Armies in the United States, or Generalissimo in other countries.

The United States became directly involved in World War I after declaring war on Germany on April 6, 1917. The declaration ended nearly three years of American neutrality in the war since the beginning, and the country's involvement in the conflict lasted for nineteen months before a ceasefire and armistice were declared on November 11, 1918. The U.S. played a major role in providing much needed supplies, raw material, and money to the United Kingdom, France, and the other Allied powers, even well before 1917.

After declaring war, the U.S. mobilized over 5 million military personnel. General John J. Pershing commanded the American Expeditionary Force (AEF) in France, in which over 2 million American soldiers served. American troops began to arrive in Europe by June 1917, first at a slow rate, but by the summer of 1918 the rate had skyrocketed to 10,000 soldiers arriving each day. Most of the ground fighting for the U.S. took place on the Western Front. At sea, the U.S. Navy would play a key role in the Allied convoy system and in the ongoing battle against German submarines. Over 116,000 American servicemen were lost in the war.

General of the Armies John Joseph Pershing (September 13, 1860 – July 15, 1948), nicknamed "Black Jack", was an American army general, educator, and founder of the Pershing Rifles. He served as the commander of the American Expeditionary Forces (AEF) during World War I from 1917 to 1920. In addition to leading the AEF to victory in World War I, Pershing 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.

During his command in World War I, Pershing resisted British and French demands that American forces be integrated with their armies, essentially as replacement units, and insisted that the AEF would operate as a single unit under his command, although some American units fought under British and Australian command, notably in the Battle of Hamel and the breaching of the Hindenburg Line at St Quentin Canal, precipitating the final German collapse. Pershing also allowed (at that time segregated) American all-Black units to be integrated with the French Army.