Question: What division of the United States Army, nicknamed "The Big Red One" landed on Normandy on D-Day?

Context articles: Leonard Lomell
1st Infantry Division (United States)
Charles Pelot Summerall
Cantigny First Division Oral Histories Collection
741st Tank Battalion (United States)
745th Tank Battalion
Charles Norman Shay
Robert Lee Bullard
Charles T. Horner Jr.
Operation Cobra

Leonard G. “Bud” Lomell (January 22, 1920 – March 1, 2011) was a highly decorated former United States Army Ranger who served in World War II.
 He is best known for his actions in the first hours of D-Day at Pointe du Hoc on the coast of Normandy, France.
 Pointe du Hoc was the site of the German Army’s largest coastal weapons, five 155-millimeter German guns with a 25-kilometer range that endangered the tens of thousands of troops landing on Omaha Beach and Utah Beach, and thousands of watercraft in the English Channel supporting the Normandy invasion.
 Unbeknownst to the Allied intelligence, the Germans had concealed the guns in an orchard, but left them operational and ready to fire.
 Through skill, courage and “pure luck,” Lomell found and quickly disabled all five guns.
 Lomell was recognized by historian Stephen Ambrose as the single individual — other than Gen. Dwight D. Eisenhower — most responsible for the success of D-Day.
 Six months later, in the Battle of Hürtgen Forest, he would again distinguish himself, earning a Silver Star for his heroism and leadership as the 2nd Ranger Battalion captured and held Hill 400.
 After the war he returned to Ocean County, New Jersey, becoming an attorney in Toms River.
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.
General Charles Pelot Summerall (March 4, 1867 – May 14, 1955) was a senior United States Army officer.
 He served in World War I, as one of the first commanders of the 1st Infantry Division ("The Big Red One"), and was Army Chief of Staff from 1926 and 1930.
 He was also the President of The Citadel between 1931 and 1953.
The Cantigny First Division Oral Histories  are a collection of video oral history interviews with veterans of the 1st Infantry Division of the United States Army, commonly known as the Big Red One.
 The First Division was the first permanent division in the regular Army, and is recognized by its ability to improve battlefield performance through learning experiences and its exceptional “esprit de corps.”
The 741st Tank Battalion was an independent tank battalion that participated in the European Theater of Operations with the United States Army in World War II.
 The battalion participated in combat operations throughout northern Europe until V-E Day.
 It was one of five tank battalions (all independent) that landed in Normandy on D-Day (6 June 1944).
 It landed on Omaha Beach supporting the 1st Infantry Division, but was attached to 2d Infantry Division on 15 June 1944, which it supported for most of the reminder of the war.
 The battalion played a key role in blunting the northern flank of the German attack during the Battle of the Bulge in December 1944.
 The 741st Tank Battalion advanced as far as Plzeň, Czechoslovakia by the end of the war.
The 745th Tank Battalion was an independent tank battalion that participated in the European Theater of Operations (ETO) with the United States Army in World War II.
 It was one of five tank battalions (all independent) that landed in Normandy on D-Day (6 June 1944).
 The battalion participated in combat operations throughout northern Europe until V-E Day.
 Unlike many independent tank battalions, which were attached to different units over time, the 745th was attached to the 1st Infantry Division for the duration of its combat operations in the ETO.
 It was inactivated in October 1945.
Shay was drafted into the military in 1943 at the age of 19.
 He was selected for training as a medical technician and learned basic surgery skills.
 Shay joined the Medical Detachment of the First Division's (Big Red One) 16th Infantry Regiment and was attached as a platoon medic to Fox Company.
 As a combat medic, Shay treated as many of his wounded comrades as possible - bandaging wounds, applying tourniquets, applying makeshift splints, administering morphine, and otherwise trying to make the wounded as comfortable as possible.
 Shay pulled several struggling soldiers from the rising tide, saving many immobilized wounded from drowning during the first wave of the landing of Omaha Beach on D-Day.
 He was also present helping the fallen at the Battles of Aachen, Huertgen Forest, and the Ardennes (Battle of the Bulge).
Lieutenant General Robert Lee Bullard (January 5, 1861 – September 11, 1947) was a senior officer of the United States Army.
 He was involved in conflicts in the American Western Frontier, the Philippines, and World War I, where he commanded the 1st Infantry Division (nicknamed "The Big Red One") during the Battle of Cantigny while serving on the Western Front.
 He later was an administrator in Cuba.
Charles Thompson Horner Jr. (May 6, 1916 - April 4, 1992) was a highly decorated officer of the United States Army who served in the 16th Infantry Regiment, U.S. 1st Infantry Division from July 1940 to February 1946 and held every position from Platoon Leader to Regimental Commander.
 As a leader in the "Big Red One", he participated in the North Africa, Sicily, and the European Campaigns and three amphibious landings; the invasions of North Africa (Operation Torch), Sicily (Operation Husky), and Europe (Operation Overlord) where he commanded the 3rd Battalion, 16th Infantry on Omaha Beach.
Operation Cobra was the codename for an offensive launched by the First United States Army (Lieutenant General Omar Bradley) seven weeks after the D-Day landings, during the Normandy Campaign of World War II.
 The intention was to take advantage of the distraction of the Germans by the British and Canadian attacks around Caen, in Operation Goodwood and break through the German defenses that were penning in his troops, while the Germans were unbalanced.
 Once a corridor had been created, the First Army would then be able to advance into Brittany, rolling up the German flanks once free of the constraints of the bocage country.
 After a slow start the offensive gathered momentum and German resistance collapsed as scattered remnants of broken units fought to escape to the Seine.
 Lacking the resources to cope with the situation, the German response was ineffectual and the entire Normandy front soon collapsed.
 Operation Cobra, together with concurrent offensives by the British Second Army and the Canadian First Army, was decisive in securing an Allied victory in the Normandy Campaign.