The idea that the bullet tip paint in tracer bullets is what make the bullet visible along its trajectory is not uncommon amongst naive grunts.
I just didn’t know that some factories endorsed this concept in their literature:
The 5.56mm M856 has an orange bullet tip, which permits observation
of the round’s trajectory to the point of impact. Because
tracers use a burning compound to produce a visual trace, they
have an incendiary effect. The 5.56mm M856 Tracer is efficient in
signaling. Much like aerial flares, the rounds are effective in conveying
pre-arranged signals between units and individuals, and
can also be used to designate targets. The 5.56mm M856 is ideal
for use in rifle M16A2, M4, and machine gun M249.
I can’t help but wonder who is the intended target for this kind of publicity.