By the time the Berlin Wall went up in August 1961, the 2nd Battle Group, 12th Infantry along with the rest of the 1st Infantry Division had been transferred back to Fort Riley, Kansas. To reinforce NATO, the 1st Division was directed to begin Operation Long Trust whereby the individual battle groups were rotated on temporary duty to West Germany. In July 1962, the 2nd Battle Group, 12th Infantry was airlifted to West Germany where it undertook several months of tactical training and testing at Wildflecken, West Germany. It was then ordered to proceed to Berlin overland through East Germany using the Helmstedt-Berlin autobahn to test the Warsaw Pact's willingness to allow NATO forces to continue to use it. Arriving without incident in Berlin to reinforce the U.S. Army's Berlin Brigade, the 2nd Battle Group was quartered at Andrews and McNair Barracks. Because of the ongoing Cuban Missile Crisis, the battle group was almost on constant alert in October 1962.