Question: What is the official nickname of the division of the United States Army that Francis Marshall served in?

Context paragraphs:
Capricia Marshall: Capricia Penavic Marshall served as Chief of Protocol of the United States from 2009 to August 2013.

Charles W. Bagnal: Lieutenant General Charles Wilson Bagnal (April 15, 1934 – June 30, 2015) was a United States Army officer.  He was commander of the United States Army Western Command (later United States Army Pacific), from 1985 to 1989.  Previously he was Deputy Commanding General for Training of the United States Army Training and Doctrine Command (TRADOC), Deputy Superintendent at the United States Military Academy (from 1977 to 1980), Commander of the 101st Airborne Division (1981-1983), Commander of the Officer Personnel Management Directorate for the United States Army Military Personnel Center, and Special Assistant to the Deputy Chief of Staff for Personnel.  He is an alumnus of the United States Military Academy, United States Army Command & General Staff College, Georgia Tech, the United States Army War College and McLenaghan High School in Florence, South Carolina (class of 1952).  He retired August 31, 1989, and later obtained his juris doctor from the University of South Carolina and practiced law.  He resided in Columbia with his wife Patsy.  Bagnal died on June 30, 2015 after a battle with leukemia.

1st Infantry Division (United States): The 1st Infantry Division is a combined arms division of the United States Army, and is the oldest continuously serving in the Regular Army.  It has seen continuous service since its organization in 1917 during World War I.  It was officially nicknamed "The Big Red One" (abbreviated "BRO") after its shoulder patch and is also nicknamed "The Fighting First".  However, the division has also received troop monikers of "The Big Dead One" and "The Bloody First" as puns on the respective officially-sanctioned nicknames.  It is currently based at Fort Riley, Kansas.

Steve Marshall (politician): Steve Marshall (born October 26, 1964) is the 48th Attorney General of Alabama, after being appointed by governor Robert J. Bentley to fill the vacancy caused by previous attorney general Luther Strange's appointment to the United States Senate.  Prior to his role as attorney general, Marshall served as Marshall County district attorney for 16 years.

United States Army Band: The United States Army Band, also known as "Pershing's Own", is the premier musical organization of the United States Army, founded in 1922.  Before 2002, the United States Army Band was the only Washington-based military band to have participated in a theater of foreign combat operations.  There are currently eight official performing ensembles in the unit: The United States Army Concert Band, The United States Army Ceremonial Band, The Army Chorus, The Army Blues, The Army Band Downrange, the U.S. Army Herald Trumpets, The Army Strings, and The Army Brass Quintet.

Marshall Court: The Marshall Court refers to the Supreme Court of the United States from 1801 to 1835, when John Marshall served as the fourth Chief Justice of the United States.  Marshall served as Chief Justice until his death, at which point Roger Taney took office.  The Marshall Court played a major role in increasing the power of the judicial branch, as well as the power of the national government.

Raymond F. Chandler: Raymond F. Chandler III (born August 25, 1962) was the 14th Sergeant Major of the Army in the United States.  He was sworn in on March 1, 2011 and active on duty until January 30, 2015.  Chandler served in all tank crewman positions and has had multiple tours as a troop, squadron and regimental master gunner.  He has served in the 1st Infantry Division (FWD), 2nd Infantry Division, 4th Infantry Division, 1st Cavalry Division, 3rd Armored Division, 2nd Armored Cavalry Regiment, 3rd Armored Cavalry Regiment, United States Army Armor School, and the United States Army Sergeants Major Academy.  He also served as First Sergeant in four different detachments, troops and companies.  As a Sergeant Major, he served as Operations SGM in 1/2 ACR and as CSM in 1/7 Cavalry, 1st Cavalry Division, United States Army Garrison Fort Leavenworth, Kansas and the United States Army Armor School CSM.  Chandler was assigned as the United States Army Sergeants Major Academy CSM in December 2007.  In June 2009, Chandler became the 19th Commandant of USASMA and the first enlisted commandant in USASMA history.

4th Cavalry Regiment (United States): The 4th Cavalry Regiment is a United States Army cavalry regiment, whose lineage is traced back to the mid-19th century.  It was one of the most effective units of the Army against American Indians on the Texas frontier.  Today, the regiment exists as separate squadrons within the U.S. Army.  The 1st Squadron of the 4th Cavalry's official nickname is "Quarterhorse", which alludes to its 1/4 Cav designation.  The 3rd Squadron of the 4th Cavalry's official nickname is "Raiders".  Today, the "1st Squadron, 4th Cavalry", "2nd Squadron, 4th Cavalry", "4th Squadron, 4th Cavalry", and "6th Squadron, 4th Cavalry" are parts of the 1st Infantry Division, while the "3rd Squadron, 4th Cavalry" serves as part of the 25th Infantry Division.  On 23 September 2009, the "4th Squadron, 4th Cavalry" officially stood up at Fort Riley, Kansas as part of the 1st "Devil" Brigade, 1st Infantry Division.  On 28 March 2008, the "5th Squadron, 4th Cavalry" officially stood up at Fort Riley, Kansas as part of the 2nd "Dagger" Brigade, 1st Infantry Division.  The 6th Squadron, 4th Cavalry served as part of the recently inactivated 1st Infantry Division, 3rd "Duke" Brigade, at Fort Knox, Kentucky.

7th Cavalry Regiment: The 7th Cavalry Regiment is a United States Army cavalry regiment formed in 1866.  Its official nickname is "Garryowen", after the Irish air "Garryowen" that was adopted as its march tune.

Francis Marshall (general): Francis Cutler Marshall was a Brigadier General in the United States Army during World War I.  He served as commanding officer of the 2nd Infantry Brigade, 1st Infantry Division.  He was awarded the Army Distinguished Service Medal for his achievements in this command during the Meuse-Argonne Offensive.

Supporting paragraphs: Francis Marshall (general) 1st Infantry Division (United States)
Answer: The Big Red One