At my department we have stressed active shooter training for years. My last range training at the end of November was an active shooter scenario. We used to be taught to assemble the first four officers on scene into a small fireteam and make entry. We have changed that to first two officers on scene. If you arrive alone and you hear shooting, you are to make entry and attempt to locate the suspect and put him down. You only wait for the next officer if you arrive and no active shooting is occuring. At the last shooter training, it was arrive on scene solo, shooting is ongoing....I made entry and had to clear the building alone...certainly makes you think about how far some departments have come since Columbine....
And some didn’t change sadly ..... Still too focused on just catching the bad guy versus stopping the “mass” killing / slaughter per se....
Hope yer well, give em hell !
Stay safe !