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

Context paragraphs:
South German Offensive: The South German Offensive is the general name of one of the final offensives of World War II in Europe.  The offensive was led by the Seventh and Third armies of the United States along with the First Army of France.  Soviet troops linked up with American forces in Czechoslovakia notably in the Battle of Slivice.  The offensive was made by the US 6th Army Group to protect the US 12th Army Group's right flank and to prevent a German last stand in the Alps.  However German resistance was much more fierce than in the north, which slowed the 6th Army Group's progress.  However, by the end of April, many German divisions surrendered without a fight to the advancing American forces to avoid the inevitable destruction.  The VI Corps of the Seventh Army linked up with the US Fifth Army, which fought through Italy, in the Alps as the Third Army advanced into Austria and Czechoslovakia, where it linked up with Soviet forces advancing from the east.  Fighting continued a few days after the Surrender of Germany on 8 May, due to German forces fighting west to surrender to the Americans instead of the Soviets.

James A. Helis: Dr. James A. Helis, Rear Admiral (United States Maritime Service), is the twelfth Superintendent of the United States Merchant Marine Academy.  A 1979 graduate of the United States Military Academy at West Point, New York, and a decorated Afghanistan War veteran, Helis served thirty years in the US Army, retiring at the rank of Colonel (United States Army).  In 2012, Helis was commissioned a United States Maritime Service Rear Admiral and appointed Superintendent of the United States Merchant Marine Academy by US Secretary of Transportation Ray LaHood.  Helis served his last eight years with the U.S. Army as an academic, culminating as Chair of the Department of National Security and Strategy at the United States Army War College, Carlisle, Pennsylvania.  Helis earned a Master of Arts in political science from the University of Pennsylvania, a Master of Military Affairs from the United States Army Command and General Staff College, School of Advanced Military Studies at Fort Leavenworth, Kansas, and a Doctor of Philosophy in international relations from the Fletcher School of Law and Diplomacy at Tufts University.  An airborne United States Army Ranger, Helis was awarded the Army Master Parachutist Badge.  Helis and his wife Jan have two sons, Dr. Corbin Helis, a physician and West Point graduate, and Ian Helis.

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.

10th Armored Division (United States): The 10th Armored Division (nicknamed "Tiger Division") was an armored division of the United States Army in World War II.  In the European Theater of Operations the 10th Armored Division was part of both the Twelfth United States Army Group and Sixth United States Army Group.  Originally assigned to the Third United States Army under General George S. Patton, it saw action with the Seventh United States Army under General Alexander Patch near the conclusion of the war.

Thomas T. Handy: Thomas Troy Handy (March 11, 1892 – April 12, 1982) was a United States Army four-star general who served as Deputy Chief of Staff, U.S. Army (DCSA) from 1944 to 1947; Commanding General, Fourth United States Army from 1947 to 1949; Commander in Chief, United States European Command (CINCEUR) from 1949 to 1952; Commander in Chief, U.S. Army Europe/Commander, Central Army Group (CINCUSAREUR/COMCENTAG), 1952; and Deputy Commander in Chief, U.S. European Command (DCINCEUR), from 1952 to 1954.

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.

United States Army Europe: United States Army Europe (USAREUR), formally United States Army Europe and Seventh Army, is an Army Service Component Command of the United States Army.  It is responsible for directing US Army operations throughout the United States European Command Area of Responsibility.  During the Cold War, HQ USAREUR supervised ground formations primarily focused upon the Warsaw Pact militaries to the east as part of the North Atlantic Treaty Organisation's (NATO) Central Army Group.  Since the Revolutions of 1989, USAREUR has greatly reduced its size, dispatched US forces to Operation Desert Shield and Desert Storm, and increased security cooperation with other NATO land forces.

Frederick Kroesen: Frederick James Kroesen, Jr. (born February 11, 1923) is a United States Army four-star general and was the Commanding General of the Seventh United States Army and the commander of NATO Central Army Group from 1979 to 1983, and Commanding General, United States Army Forces Command from 1976 to 1978.  He also served as Vice Chief of Staff of the Army from 1978 to 1979.  He commanded troops in World War II, the Korean War, and the Vietnam War, enabling him to be one of the very small number who ever was entitled to wear the Combat Infantryman Badge with two Stars, denoting active combat in three wars.

Operation Quicksilver (deception plan): Operation Quicksilver was a Second World War military deception.  Undertaken by the Allies in 1944, the operation threatened an invasion of France in the Pas de Calais region through the simulation of a large Field Army in South East England.  Quicksilver formed part of the Operation Fortitude deception, itself part of the strategic Operation Bodyguard plan.  The key element of Quicksilver was the creation in German minds that "First United States Army Group" (FUSAG) commanded by General George Patton supposedly would land in the Pas-de-Calais for the major invasion of Europe, after the landings in Normandy had lured the German defenders to that front.  (FUSAG was a genuine army group headquarters which later became Omar Bradley's 12th Army Group, but was given a fictitious role and many non-existent divisions for purposes of deception.)

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.

Supporting paragraphs: Twelfth United States Army Group Omar Bradley
Answer: Brad