During WWII, that was already the flag of the Republic of China, which happened to be the only "China" in existence at the time.
No other flag was used then, so it would be anachronistic to use communist China's flag here, and Taiwan was not part of China at the time so it would be even worse to talk about Taiwan fighting the war.
Quite right. Also the flags of other countries are shown as they were at the time. Nazi and Soviet flags are obvious, as is the case for Yugoslavia which existed then and is no more, but the flags of Greece and Burma are contemporary as well.
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Who else noticed the flag of China? It should be called ROC or Taiwan if you use that flag.
Not at all.
During WWII, that was already the flag of the Republic of China, which happened to be the only "China" in existence at the time.
No other flag was used then, so it would be anachronistic to use communist China's flag here, and Taiwan was not part of China at the time so it would be even worse to talk about Taiwan fighting the war.
Quite right. Also the flags of other countries are shown as they were at the time. Nazi and Soviet flags are obvious, as is the case for Yugoslavia which existed then and is no more, but the flags of Greece and Burma are contemporary as well.
ROC is still "China".