FEEDBACK Ralph Zumbro comments:- When I was a kid back in the 40's we used to shoot BB guns and you can SEE the BBs travelling and adjust your points of reference on the gun. Later, in the military, I found out that the same trick can be done with tracers and they make tracers in 9mm and .45. After being assigned to handle ammo for a while. I took advantage of the capability and issued .45 tracer to all the tanks and used it myself. I highly recommend the practice for training ....Although the CO did get bent out of shape when I wrote my name in the night sky over Bong Son with a belt of solid tracer.