15 fiery photos of tracer bullets lighting up the sky

Tracer rounds contain flammable materials that ignite and produce a bright (but deadly) trail of light towards a target. Intended to guide the shooter during adverse conditions, they can prove to be extremely valuable during low-visibility scenarios.

Due to the fact that an enemy can potentially see where the shots are coming from, they are normally used sparingly — often distributed between several normal rounds.

See Also:

SEE ALSO: These 14 photos show how infantrymen bring down tanks