Corrected entry: There is a scene in a movie when Russian techs dressed into chemical protection suits are fueling the missiles. The problem is that Russian missiles that are shown in the movie use liquid fuel that is highly corrosive (that is one of the reasons the techs are wearing protection suits). So, according to the Soviet Army regulations, missiles are fueled only on one occasion if they are to be launched as soon as the fueling is done. But there are no nuclear attacks in the movie, though there had to be some, as those missiles can't be stored in a fueled state. As for the real life, according to the Soviet officers who were on Cuba during the real Missile Crisis, no orders concerning preemptive nuclear strike against US were given and the missiles were never fueled.