Question: What was the nickname of the General of The Twelfth United States Army Group?

full_context: Document 1: John A. Bradley: John A. Bradley (born c. 1945) was a lieutenant general in the United States Air Force who served as Commander of the United States Air Force Reserve Command, Headquarters U.S. Air Force, Washington D.C., and commander, Headquarters Air Force Reserve, a separate operating agency located at Robins Air Force Base, Georgia. As chief of Air Force Reserve, he served as the principal adviser on Reserve matters to the Air Force Chief of Staff. As commander of AFRES, he had full responsibility for the supervision of U.S. Air Force Reserve units around the world. He served in this position from November 1994 to June 1998.
Document 2: Maxwell D. Taylor: General Maxwell Davenport "Max" Taylor (August 26, 1901 – April 19, 1987) was a senior United States Army officer and diplomat of the mid-20th century. He served with distinction in World War II, most notably as commander of the 101st Airborne Division, nicknamed "The Screaming Eagles". After the war he served as the fifth Chairman of the Joint Chiefs of Staff, having been appointed by President John Kennedy. He is the father of biographer and historian John Maxwell Taylor and military historian and author Thomas Taylor.
Document 3: Fleet Marine Force, Pacific: The United States Fleet Marine Force, Pacific (FMFPAC) is the largest maritime landing force in the world. Its units are spread across the Pacific Ocean and reports to the United States Pacific Command. It is headquartered at MCB Camp H. M. Smith, HI and directs and commands all the subordinate elements of the Navy Expeditionary Strike Force and Marine Air-Ground Task Force components that follow under the 3rd, 5th, and 7th Fleet and the Marine Corps Forces, Pacific (MARFORPAC). The Commanding General of Marine Corps Forces, Pacific is dual-posted as the Commanding General of Fleet Marine Force, Pacific. FMFPAC is under operational control of the Commander, United States Pacific Fleet (COMPACFLT), when deployed.
Document 4: Twelfth United States Army Group: The Twelfth United States Army Group was the largest and most powerful United States Army formation ever to take to the field. It controlled the majority of American forces on the Western Front in 1944 and 1945. It was commanded by General Omar Bradley with its headquarters established in London on 14 July 1944.
Document 5: OB West: The German Army Command in the West ("Oberbefehlshaber West" (German: initials OB West) was the overall command of the Westheer, the German Armed Forces on the Western Front during World War II. It was directly subordinate to German Armed Forces High Command. The area under the command of the OB West varied as the war progressed. At its farthest extent it reached the French Atlantic coast. By the end of World War II in Europe it was reduced to commanding troops in Bavaria.
Document 6: Sixth United States Army Group: The Sixth United States Army Group was an Allied Army Group that fought in the European Theater of Operations during World War II. Made up of field armies from both the United States Army and the French Army, it fought in France, Germany, Austria, and, briefly, Italy. Also referred to as the Southern Group of Armies, it was established in July 1944 and commanded throughout its duration by General Jacob L. Devers.
Document 7: George S. Patton: General George Smith Patton Jr. (November 11, 1885 – December 21, 1945) was a senior officer of the United States Army who commanded the U.S. Seventh Army in the Mediterranean and European theaters of World War II, but is best known for his leadership of the U.S. Third Army in France and Germany following the Allied invasion of Normandy in June 1944.
Document 8: George G. Finch: Maj. Gen. George G. Finch became the Senior Leader of the US Air National Guard; (Chief of the Air Division National Guard Bureau) (1948-1950) In June 1953 it was reported that Gen. Mark W. Clark would retire and be replaced by Maj. Gen George G. Finch on the UN command delegation to the Korean armistice talks George G. Finch, born April 11, 1902 in Dade City, Florida, is considered one of the pioneers in United States aviation history. He began his military career during World War 1, enlisting in the Aviation Section of the Army's Signal Corps in 1918. He remained in the Reserve Corps after the war, and in 1926, became Commander, 27th Pursuit Squadron, 1st Pursuit Group. In 1940, Georgia Governor Ed Rivers commissioned him to form the first flying unit of the Georgia Air National Guard. The unit was mobilized into the U.S. Army in September, 1941, with Major Finch as commander. After World War II, he was a leading critic of efforts to eliminate the air arm of the National Guard during peacetime. General Finch gained the respect and admiration of Air National Guardsmen throughout the nation with his steadfast support and successful efforts to preserve the Air Guard. He became the first Chief of the Air Force Division of the National Guard Bureau in 1948. Under his leadership, the Air National Guard built to combat readiness and was among the first components called into service after the outbreak of the Korean War. As a result of General Finch's vision and perseverance, 45,000 highly trained officers and airmen of 22 wings and 65 squadrons gave the Air Force the strength it needed in the early, critical phases of the Communist drive down the Korean peninsula.General Finch served as the senior Air Force member of the United Nations negotiating team at the peace talks at Panmunjom, Korea, and received the Legion of Merit for outstanding service in 1955; General Finch assumed command of Fourteenth Air Force, Robins AFB, Georgia, becoming the nation's first Air National Guardsman to head a numbered air force. General Finch had a career of "firsts" including the US Army's first night landing with a single, five-million-candlepower floodlight in 1927. He also established and endowed the General John P. McConnell Award at the United States Air Force Academy. Considered by many as the father of the strong, independent Air National Guard existing today, General Finch retired in 1957. No man has had greater impact on the Air Force Reserve and National Guard than has General George G. Finch.A graduate of the University of Georgia and a member of the Georgia Bar, General Finch was enshrined in the Georgia Aviation Hall of Fame May 18, 1996.
Document 9: 21st Army Group: The 21st Army Group was a World War II British headquarters formation, in command of two field armies and other supporting units, consisting primarily of the British Second Army and the First Canadian Army. Established in London during July 1943, under the command of Supreme Headquarters Allied Expeditionary Force (SHAEF), it was assigned to Operation Overlord, the Western Allied invasion of Europe, and was an important Allied force in the European Theatre. The 21st Army Group operated in Northern France, Luxembourg, Belgium, the Netherlands and Germany from June 1944 until the end of the war in Europe in May 1945, after which it was redesignated the British Army of the Rhine (BAOR).
Document 10: Joseph Dunford: Joseph Francis Dunford Jr. (born December 8, 1955) is a United States Marine Corps General. He is the 19th Chairman of the Joint Chiefs of Staff. He was also the 36th Commandant of the Marine Corps. Dunford is the first Marine Corps officer to serve in four different four-star positions; the others include commander of the International Security Assistance Force and United States Forces-Afghanistan from February 2013 until August 2014, and as the 32nd Assistant Commandant of the Marine Corps from October 23, 2010, to December 15, 2012. He has also commanded several units, including the 5th Marine Regiment during the 2003 invasion of Iraq. As Chairman, Dunford is the highest-ranking military officer in the United States Armed Forces.
Document 11: William Westmoreland: William Childs Westmoreland (March 26, 1914 – July 18, 2005) was a United States Army general, who most notably commanded U.S. forces during the Vietnam War from 1964 to 1968. He served as Chief of Staff of the United States Army from 1968 to 1972.
Document 12: Matthew Ridgway: General Matthew Bunker Ridgway (March 3, 1895 – July 26, 1993) was the 19 Chief of Staff of the United States Army. He served with great distinction during World War II, where he was the Commanding General (CG) of the 82nd Airborne Division, leading it in action in Sicily, Italy and Normandy, before taking command of the newly formed XVIII Airborne Corps in August 1944, holding this post until the end of the war, commanding it in the Battle of the Bulge, Operation Varsity and the Western Allied invasion of Germany.
Document 13: XII Corps (United States): The XII Corps fought from northern France to Austria in World War II. Constituted in the Organized Reserves in 1933, it was activated on 29 August 1942 at Columbia, South Carolina. XII Corps became operational in France as part of Lieutenant General George S. Patton's Third Army on 1 August 1944. Initially commanded by Major General Gilbert R. Cook, bad health forced MG Cook to relinquish command to Major General Manton S. Eddy within three weeks. MG Eddy commanded the corps until late April 1945, when his own health problems forced him to turn over command to MG Stafford LeRoy Irwin.
Document 14: Omar Bradley: General of the Army Omar Nelson Bradley (February 12, 1893 – April 8, 1981), nicknamed "Brad", was a highly distinguished senior officer of the United States Army during and after World War II. Bradley was the first Chairman of the Joint Chiefs of Staff and oversaw the U.S. military's policy-making in the Korean War.
Document 15: Colin Powell: Colin Luther Powell ( ; born April 5, 1937) is an American statesman and a retired four-star general in the United States Army. Powell was born in Harlem as the son of Jamaican immigrants. During his military career, Powell also served as National Security Advisor (1987–1989), as Commander of the U.S. Army Forces Command (1989) and as Chairman of the Joint Chiefs of Staff (1989–1993), holding the latter position during the Persian Gulf War. Powell was the first, and so far the only, African American to serve on the Joint Chiefs of Staff. He was the 65th United States Secretary of State, serving under U.S. President George W. Bush from 2001 to 2005, the first African American to serve in that position.
ground_truth: Brad