This weekend I was monitoring Santa Rosa Sheriff when the alert tones went off across all the channels and the dispatcher asked all 10-8 units to 10-70 (switch to) Escambia. I picked up the SRSO units on ECSO N. Tac (Ch-7) calling out street intersections and saying No Lights. Units were doing this across the county. I also heard Pensacola Police and Escambia Sheriff making the same calls, “Intersection & No Lights” Does anyone know why they do this?? Seems like some kind of exercise. I heard them do this once before.