GRAFENWOEHR, Germany -- The first 19 heavy tanks from 1st Battalion, 66th Armor Regiment arrived Jan. 27 at U.S. Army Garrison Bavaria, Tower Barracks, Grafenwoehr.The 1-66 Regiment is part of the 3rd Armored Brigade Combat Team, 4th Infantry Division, known as the Iron Brigade, out of Fort Carson, Colorado.The 3ABCT is the current regionally aligned heavy U.S. brigade for U.S. Army Europe. The brigade began arriving in Europe January 2017 to support U.S. Army Europe and participate in Operation Atlantic Resolve.The brigade initially assembled in Poland to distribute units across central and Eastern Europe.The remaining 1st Battalion, 66th Armor Regiment will move to Grafenwoehr Training Area to participate in Exercise Combined Resolve VIII, while the 1st Battalion, 68th Armor Regiment exercises in Estonia, Latvia and Lithuania; the 1st Battalion, 8th Infantry Regiment in Romania and Bulgaria; and the 4th Squadron, 10th Cavalry Regiment in Poland and Hungary.The deployment is part of the U.S. mission Operation Atlantic Resolve, which is aimed at ensuring security and stability within the NATO alliance.