Major Lost Thought

I was watching Man Behind the Curtain (3x20) and young Ben gets home and takes the beer out of his fathers hand and attempts to take his sleeping fathers boots off. If you look Roger has a Swan patch on his jumpsuit. This instance is between 1973 and 1977. How is he wearing this patch before 1977? In 1977 Stuart Radzinsky was willing to break the treaty and kill the hostile (Sayid) rather then let him go because he saw the Swan mode. So why was Roger wearing this patch to a very secretive project? Also when Roger is seen in season 5 how is his patch now back to being the normal DHARMA patch? Was this just a mistake by the production crew? Or is this of major importance?

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