Whats the rule if you hit one? is it like driving where you cant pick it up but the next guy can?
Or maybe its like the rule on tracer, if you need to go down range to put out a fire that is fine but we aren't stopping our normal shooting, could make an interesting retrieval.
In all seriousness they mentioned this on the RCO course, "No need to stop shooting as long as everyone is comfortably hitting the target" would be different if they were much closer to the firing point or the target though. The army are apparently often encourage as mentioned before.
Scooby