As a side note, I wonder if Police are exempt from all those noise ordinances that they like to enforce.
A bottle rocket could do some damage to the Sheriff's Department helicopters that are used. The cockpit of those are not entirely enclosed and if the rocket went into the cockpit and exploded in the face of the operator it could be a bad scenario. The Sky Knights that are used by the LA Sheriff's Department fly small helicopters that have a pilot and a spotter in them and are not the large helicopters that come to mind.