Shelby's Iron Brigade Brigade. The 3rd Brigade Combat Team, 1st Infantry Division was known as the Iron Brigade from its formation in 1917 through World War I, World War II and Vietnam, until some time in the early 2000s when, for reasons that are still unclear, the name was changed to Duke Brigade. The unit crest was an Iron Cross in a triangle, it appears that that was also changed. The 3rd Brigade of the 4th Infantry Division is also known as the Iron Brigade. Its unit crest is similar to the medals issued to veterans of the both Western and the Eastern
Battle of the Iron Triangle had been killed. The expected PAVN counterattack came on the night of 5/6 June as two battalions of the 271st Regiment, supported by up to 14 tanks attacked from two directions. The ARVN held and its infantrymen knocked out 5 tanks and damaged 5 others. The second phase or the Iron Triangle campaign was over with the recapture of An Dien, and General Thuần was anxious to get the attack moving again toward Base 82 and Rach Bap. Although the An Dien bridge would soon be in condition to carry the tanks of the 318th Task Force, one company of