American soldiers are called American soldiers, Japanese soldiers are called Japanese soldiers, Soviet soldiers are called Soviets and China soldiers are not called Zhong Jun.
This is the abbreviation for the armies of other countries. For example, the Soviet army is sometimes called the "Soviet Red Army" and our own army is generally called the "People's Liberation Army" or "People's Liberation Army". This abbreviation is mainly used in foreign reports. The first word is the country name, which makes it easier to distinguish which country's armed forces are. I hope my answer is useful to you!