In some cases, the collections are strictly for fun, but there are serious collectors who actively look for rare, unusual, or antique buttons.
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Shields with Letters Shield with I : Infantry.
Naval aviators, naval flight officers, naval flight surgeons, naval aviation physiologists, and naval aircrewmen are authorized to wear G-1 seal-brown goatskin-leather flight jackets, with warfare insignia listed on a name-tag rank optional over the left breast pocket, either permanently stitched to the leather or attached with a Velcro hook-and-loop fastener.