Tracers are fun, and very useful from a military perspective. But, they burn.
One of the big headaches with tracer burn was that, dropped into dry ground, they might ignite dry fuel laying on the ground. Leave, twigs, etc. And the unit conducting the firing was responsible for putting out the fire. So, you'd have this cool live-fire going one and suddenly you'd be in fire fighter mode.
The tracer from the .50 BMG was notorious for this because it carried such a big tracer. For some reason, tank-gun ammo, which carried a huge tracer, set a whole lot fewer fires than .50 BMG ammo. Perhaps because when you're shooting the machine gun, you get so much more chances to start a fire.
Sometimes, it comes down a ong way from the range area. As I recall, the tracer burnout on a .50 was 1600 meters.