All of the following proved to be a challenge for US forces in the Pacific Theater EXCEPT
A. High casualty rates
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B. Maintaining a supply line over a vast distance
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C. Harsh conditions due to the tropical climate
D. The Japanese had successfully broken every Allied encoded communication

After the success of the sputnik launch, the united states feared that they would never be able to launch their own satellite, the ussr had used technology developed by the united states, the soviets had superior nuclear capabilities, that any future us satellites would not be as successful.