with nuclear weapons. Several temporary SAC "Reflex" deployments of B-47 bombers were also made to bases in the United Kingdom and North Africa. The 1960s 1961 Berlin Crisis The 1961 Berlin Crisis became USAFE's first test of what was known as a "Flexible Response" strategy. In the spring of 1961, Soviet Premier Nikita Khrushchev decided that the Soviet Union would sign a peace treaty with the East German government. In effect the German Democratic Republic would control the Russian zone of Berlin and could end joint occupation of the city. This action was a clear violation of the Potsdam Agreement of 1945. When the Western allies objected to this proposed peace treaty, Khrushchev began speaking about restricting the West's aerial access to Berlin and preventing the entry of East Germans into the city. This possibility started an exodus of Germans from the eastern zone as they rushed to leave their sector and relocate in West Germany. Departures snowballed from a few dozen refugees daily to a flow of 4,000 per day by August 1961. On the night of 12 August 1961 the Soviet backed East German government began erecting the Berlin Wall to prevent this flow of workers from communism, precipitating a new Cold War crisis that had been brewing for the previous twelve months. Berlin became a divided city. The response agreed to by the Kennedy Administration was to rapidly increase tactical airpower in Europe during the summer of 1961. The Air Force responded with a two-phase deployment of reinforcements to Europe – the largest such overseas movement of aircraft since World War II. The first phase began on 5 September with Operation Tack Hammer. Tactical Air Command launched eight F-100D Super Sabre squadrons from its Composite Air Strike Force to augment USAFE strength with 144 fighters. All Tack Hammer fighters moved across the Atlantic Ocean with aerial refueling en route. The TACK HAMMER deployment was an interim measure until ANG units could relieve Tactical Air Command squadrons. The Air National Guard was tasked to supply six tactical fighter wings and one tactical reconnaissance wing to expand USAFE. Also deployed to Europe was the ANG 152d Tactical Control Group consisting of six Tactical Control Squadrons, manned by 230 officers and 1,850 airmen with mobile ground radar and radio equipment to control tactical air power on the battlefield. It was dispersed throughout West Germany. The second phase began with the