You can only see half in this picture, but it's an example of the same patch. The glow portion has been covered with gun tape. Other guys will do the same but may even tape up the reflective portion as well. There's really no hard and fast rule on them regarding wear. As Yeoman pointed out sometimes it's either not worn at all by choice, or by the mere fact that they tend to fall apart just from regular wear on the uniform.
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