I believe the answer is option A
On August 20, 1968, the Soviet<span> Union led Warsaw Pact troops in an </span>invasion of Czechoslovakia<span> to crack down on reformist trends in Prague. Although the </span>Soviet<span>Union's action successfully halted the pace of reform in </span>Czechoslovakia<span>, it had unintended consequences for the unity of the communist bloc.</span>
Answer:
They found the missle was powered by a liquid-propellant rocket engine
Explanation:
The Selective Service Act authorized a draft of young men to be soldiers
As for your second question, its only obvious that those who didn't qualify for military service filled the demand for civilian work