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countries were confident that allies would fight with them if they declared war.
danger that some European countries might become communist
Not always. There are a few small countries on this planet that have no army and a few others who try to keep the size and expense as minimal as possible. But most countries traditionally have an army. The USA because it sees itself (up to now, at least) as the policeman of the world; many others because they face clear and present danger from insurgents, religious fanatics and/or neighboring countries; others because having an army adds to their standing among fellow countries - or provides them with a useful means of adding pressure in diplomatic conflicts with them.
U.S.S.R. {| |- | The rival was the Soviet Union. It began as the US and Soviets divided up responsibility for policing the defeated Axis countries. It escalated when the Soviets developed nuclear weapons. |}
the biggest danger toward the US troops was the disease in Mexico