Answer

A selected list of bibliographic references for the 3d Infantry Regiment, known as the "Old Guard" follows: 

Borisov, Alexander.  “The Old Guard Fife and Drum Corps:  50 Years and Still Marching Strong.” Soldiers  (Jul 2010):  pp. 4-8. 

Gorn, John W.  "Old Guard!--Pass in Review!"  Army Information Digest  (May 1963):  pp. 24-29. 

Heflin, Kirk, & Hanson, Thomas E.  “3d United States Infantry Regiment (The Old Guard).”  On Point  (Summer 2007):  pp. 30-35. 

"Inside the Old Guard."  Soldiers  (May 1993):  pp. 38-40. 

Mahon, John K., & Danysh, Romana.  Infantry, Vol. 1:  Regular Army.  In the official Army Lineage Series.  Wash, DC:  CMH, 1972.  pp. 159-78.  UA28.M352.

"'Oldest' in the Army."  Army and Navy Register  (24 Feb 1940):  p. 23. 

"Regimental Heraldry-3rd Infantry."  Recruiting News  (Oct 938):  p. 9. 

Rodenbough, Theophilus F., & Haskin, William W.  The Army of the United States:  Historical Sketches....  NY:  Maynard, Merrill, 1896.  pp. 432-51.  UA25.A76.

Sawicki, James A.  Infantry Regiments of the US Army.  Dumfries, VA:  Wyvern, 1981.  pp. 52-54. #603-1.1981. General history of unit.

Scully, Timothy.  "Old Guard."  Infantry  (Nov/Dec 1979):  pp. 6-7. Description of organization & duties by unit officer.

"Tradition on Parade."  Army Digest  (Dec 1968):  pp. 50-53. 

U.S. Army.  3rd Infantry Regiment.  The Third Infantry, of "The Old Guard of the Army".  Bound with other materials, ca 1908-10.  #603-3.19--?

___.  The Old Guard:  History of the Third Infantry Regiment.  Wash, DC: 1970.  24 p.  #603-3.1970. Earlier editions of same title, #603-3.1958/2 & #603-3.1958/2.1961e.

___.  The Old Guard:  A Story of the Third Infantry Regiment.  Wash, DC: 1965.  20 p.  #603-3.1965. Earlier editions of same title, #603-3.1955, #603-3.1956 & #603-3.1959.

___.  The Third United States Infantry (The Old Guard):  The Army's Official Ceremonial Unit and Escort to the President.  n.p., 1974.  44 p.  #603-3.1974.

Wensyel, James W.  "The Old Guard."  Army  (Aug 1996):  pp. 38-42 & 44-45.