American pilots encountered surface-to-air missiles (SAMs) for the first time in the Vietnam War, as an F-4 Phantom II jet and its crew of two USAF officers was shot down by a Soviet-made S-75 Dvina (referred to in the West as the SA-2 Guideline missile).
Geophysicist J. Tuzo Wilson announced a major discovery in plate tectonics with the publication in the journal Nature of his paper, "A New Class of Faults and Their Bearing on Continental Drift", describing the "transform fault", a boundary between tectonic plates characterized by a horizontal motion [REF].