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Infrared (IR) flags are used for friend-foe recognition at night, reflecting infrared light to identify team members. Two different IR materials are typically used for military or civilian badges. Compare the materials here.
Above, you can see them on the upper arm, but they can also be on the helmet or on the front of the chest: Infrared (IR) flags help with friend-foe recognition at night, as they reflect infrared light. Anyone who radiates belongs to our own team. There are two different types of IR materials used for the production of such badges, whether military or civilian. Below you can see the two materials compared (click to enlarge):
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