The third of the annual NATO command post exercise to train Western Europe units for escalating nuclear conflict and prompted by intelligence that suggested under code-name Operation RYaN (РЯН, “Nuclear Missile Attack,” Ракетно Ядерное Нападение) a coordinated campaign to monitor decision-makers in government and military hierarchies for the intent to launch a first strike against the Soviet Union and a string of infiltration maneuvers on both sides to see to what extent that spies could penetrate the opposing sides’ defences before detection, the war game, began on this day in 1983. The added sense of realism to the execution with coded communiques and radio black-outs in light of increased rhetoric from Ronald Reagan (sabre-rattling that was taken with dread earnestness) and the scheduled delivery of additional missiles for staging in the theatre, reportedly caused some in Soviet leadership to believe that Able Archer 83 was a ruse de guerre to distract from actual preparations and placed units in Poland and East Germany on high alert and began priming their fuses. Tensions as high as during the Cuban Missile Crisis two decades earlier, the Chief of Staff for the US Air Force in Europe convinced Washington not to respond in kind, de-escalating the situation by the end of the simulation.