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In the US military, a person with red hair. This comes from comparing them to a "tracer", a firearms cartridge that has a bit of burning magnesium at the base of the bullet, which burns and can be seen as the bullet flies through the air. The term "tracer" can refer to either their hair resembling the red path of a tracer bullet flying, or the fact that tracer ammunition in NATO has the tips of the bullets painted red so that specialized ammo can be visually identified.
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