It might not be from USA. Meyer made a lot of badges for various South American countries as well. I have collected US badges for quite a while and I have never seen this one.
With regard to the question on colour versus arm of service, it is actually quite complicated. In general the air force use silver, the army use gold and the navy use both (silver for enlisted ranks and gold for officers). However there are exceptions to these generalisations. You also then have to contend with a whole range of other non military agencies with similar looking badges. All good fun !
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