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Tracer bullets allowed the military to see where they were shooting at night. these bullets sometimes also made it easier for enemy troops to track the source of the bullet shooter. Tracer rounds were used as the second or third to last to alert the troops their ammo was almost out.
Tracers were also used to shoot down zeppelins because they could ignite the hydrogen gas and take the ship down faster than a normal bullet.

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The United Kingdom in 1915.
The United States in 1917.

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Tracer bullets are bullets that have a small firework in the bullet that burn brightly when fired, leaving a visible trail