Hogan, Jr., David W., U. S. Army Center of Military History, Centuries of Service, The U.S. Army, 1775–2004, pamphlet, Center of Military History, United States Army, Washington, D.C., 2004, CMH Pub 70–71–1, p. 4. http://www.history.army.mil/books/cos/3-9.htm, retrieved September 28, 2010; http://www.history.army.mil/html/faq/branches.html, retrieved September 28, 2010; erreur modèle {{Lien archive}} : renseignez un paramètre « |titre= » ou « |description= »Wayback Machine.