Military Aircraft Models For Sale

Why are there some planes that have a Flag or national symbol on the rudder along with the Fuselage symbol?

My question is why do some military planes and helicopters have both the Fuselage insignia and then one of the following on the Tail Rudder: A Flag, another Insignia, or The Tricolor? I know this has been done on planes since World War 1 to the present day but I do not know the reasoning for doing this. The countries that I have seen this on are Germany, Great Britain, France, Former Soviet Union, India, Poland, Romania, Hungary, Egypt, Iraq, Libya, Syria, Indonesia, Mali, Bulgaria, Cuba, Peru, Australia, Brazil, Canada, Thailand and probably many more that I don't know about.
Is there any reasoning significance for this? Below are some links to pictures to show what I am asking about.

its just further identification i guess.in world war 2, the RAF had the RAF roundel, but with a yellow ring to designate what theatre or operation they were flying in, and the tricolour/bi colour or "flash" as they are called, to further show what nation they are from.

Also, a more logical reason i can think of, is that in the event of the crash, each major piece of the plane has a form of nation identification, say a flag, roundel or a flash to identify it, incase some parts of the aircraft are lost.

Also, in combat operations, if an aircraft is at an unusual angle, then other allies must be able to easily identify it, so these markings are placed on various locations, so they can be seen from any angle (except head/tail on)

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