The Chinese military first used bugle calls and signals to relay signals and communicate instructions among its soldiers. They used bugle calls during the Korean War which happened in 1950 up to 1953.
It was said that the Chinese military use of bugle calls, which emitted sounds that were hauntingly unfamiliar to the American and Korean soldiers, is a form of psychological warfare that left said soldiers shaken and unable to defend their positions resulting to their deaths.
The answer is the imperial Germanys
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I'm not sure about question number 1 but number 2: It was dubbed "The Cold War" because neither United States or the Soviet Union declared war. Hope this helps :}
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C and D are correct I'm sure America saw it as a type of weapon so they set up all this defense and people in programs one being called NASA.
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Hope this helped.
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