Actually, that's quite an accurate manual. If you were in China during WWII you'd be able to differentiate many Japanese from many Chinese. Jumpy, what you might be forgetting is that in 1940's hardly anybody had ever seen enough Japanese and Chinese people to be able to point who is who. What about Koreans? They could've added Koreans into the fray, they are different from both Japanese and Chinese. Actually, If the Japanese used Korean agents and you had no Korean manual you'd be in quite a trouble then. :rotfl: Ah, the hell, just recruit Taiwanese and then it's all dufus.
You want an example of not being able to tell anyway? Then I challenge you:

Guess the nationality and ethnicy of this man.

Now of this one.

And this one.

And this one.

And this one to test if you've really read the manual.