After the Korean War, the first major Cold War crisis began on 13 August 1961, when Berliners woke up to find they lived in a divided city. A wall now separated East Berlin from West Berlin. With that provocative act, the Soviet Union ratcheted up the Cold War. Eleven additional squadrons were called up in 1968 in response to the seizing of the U.S. Navy ship Pueblo by North Korea, and two tactical fighter squadrons, the 166th (Ohio) and the 127th (Kansas) were sent to South Korea. In May 1968 one aeromedical airservice group and two tactical fighter groups were federalized.