Michael G. Knapp is the Director of Historical Services for the American Battle Monuments Commission. He previously served as a Historian with the Contemporary Studies Branch of the US Army Center of Military History in Washington, DC, and was detailed as a Museum liaison officer to the U.S. Department of Defense Vietnam War Commemoration Commission. He is the co-author of The Organization and Insignia of the American Expeditionary Force, 1917-1923, and has contributed to The United States in the First World War: An Encyclopedia, The Historical Dictionary of the U.S. Army, 100 Greatest Military Photographs and World War One Vault.