As there was no prescribed insignia for this rank, General Pershing chose the four stars of a full general, except in gold. The rank has been argued to be equivalent to "6-star" general, as the insignia of the next lowest rank "General of the Army" is designated by five stars. According to the biography Until the Last Trumpet Sounds by Gene Smith, Pershing never wore the rank on his uniform.
Assignment history
1882: Cadet, United States Military Academy
1886: Troop L, Sixth Cavalry
1891: Professor of Tactics, University of Nebraska-Lincoln
1895: 1st Lieutenant, 10th Cavalry Regiment
1897: Instructor, United States Military Academy, West Point
1898: Major of Volunteer Forces, Cuban Campaign, Spanish–American War
1899: Officer-in-Charge, Office of Customs and Insular Affairs
1900: Adjutant General, Department of Mindanao and Jolo, Philippines
Richard Goldhurst, Pipe Clay and Drill: John J. Pershing, the classic American soldier, (Reader's Digest Press, 1977)
Gene Smith, Until the Last Trumpet Sounds: The Life of General of the Armies John J. Pershing (Wiley, New York, 1998) ISBN978-0-471-24693-0
Donald Smythe, Guerrilla Warrior: The Early Life of John J. Pershing (Charles Scribner's Sons, New York, 1973) ISBN0-684-12933-7
Donald Smythe, Pershing: General of the Armies (Indiana University Press, Bloomington, 1986) ISBN0-253-21924-8
Frank E. Vandiver, Black Jack: The Life and Times of John J. Pershing - Volume I (Texas A&M University Press, Third printing, 1977) ISBN0-89096-024-0
Frank E. Vandiver, Black Jack: The Life and Times of John J. Pershing - Volume II (Texas A&M University Press, Third printing, 1977) ISBN0-89096-024-0
Yockelson, Mitchell A. (May 30, 2008). Borrowed Soldiers: Americans under British Command, 1918. Foreword by John S. D. Eisenhower. University of Oklahoma Press. ISBN978-0-8061-3919-7.