Years ago we were at a NAval Air Station, and one of my jobs was the medical cover or the Air Day
We needed a "recall system" that would be recognisable by Service personnel, the Emergency Services and Volunteer services. This way we could put a plan into place to repsond without alerting or panicking the public
We settled on "Downbird"
With 4 categories covering an aircraft down without injury to aircraft down with major civilian casualties we were settled, and everyone briefed.
Then the week before we were given the final copy of the brochure / programme
On page 3 was a whole section on "announcements and codes" which detailed the Downbird codes in detail!
Far too late to change everything and brief all the stakeholders and too expensive (and late) to reprint the brochures, so we had to go with it