text: As the President argues with General Renning, it is reported that the Soviets have launched a second attack. The president reluctantly authorizes a multi-part all-out attack, with US ICBMs launched immediately, then submarine-launched ballistic missiles (SLBMs) in a few hours, coincident with the arrival of US Air Force bombers over the Soviet Union. General Renning issues the orders just before the first wave of Soviet missiles hits SAC headquarters and passes command of SAC to "Alice," the codename of an Air Force general in command of Looking Glass, a flying command aircraft for the US Air Force. The president takes off in Marine One and learns the second Soviet attack was directed at China, since it had launched its own missiles against the Soviets. Realizing his mistake, the president tries to cancel the retaliation order, but before he can do this a nearby nuclear detonation forces down his helicopter.
  A B-52 bomber, commanded by Major Cassidy and his co-pilot Captain Moreau, takes off with callsign "Polar Bear 1" moments before Fairchild Air Force Base is destroyed. The crewmen are shaken by the unfolding events; while fighting off Russian interceptors a nuclear flash partially blinds Moreau and the ensuing shock wave kills another crew member. The bomber proceeds into eastern Russia.