Flat Dark Earth is a mild Brownish Color as pictured here David : google.com/search?q=flat+dark+earth&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjerfXPkaTaAhXns1kKHQ53AqAQ_AUICigB&biw=1280&bih=618#imgrc=kFN7Zk6YbfXJWM:

It is a greenish brown to me most of the guns look like a shade of olive drab (military color) some guns are more green some more tan

Depending on the manufacturer the shade of the color can vary from a slight brownish tan to a olive greenish tan. Hope that helps!

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Desert tan looking. Sometimes light or dark brown is considered FDE too.

It is a greenish brown to me most of the guns look like a shade of olive drab (military color) some guns are more green some more tan