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What color is the Red Army hat and how to distinguish it?

1. The Red Army caps in movies and TV series mainly come in two colors, gray and blue.

2. Usually the service caps and uniforms of the Red Front Army are gray, while the service caps and uniforms of the Red Fourth Front Army are blue.

3. During the same period, the Central Army of the Kuomintang Army basically wore olive green uniforms for officers and yellow uniforms for soldiers.