County wide, and it is a lot. To clarify, that doesn't mean 30 separate incidents. If two officers return fire in the same incident, that's counted as two officers involved, but that's still a big increase over the last few years. Gunfire deaths are up nationwide this year for law enforcement, and our county seems to be accelerating faster than average. Our homicide rate is way up over last year, too, despite national trends down. I think we're on pace for about 160-170 homicides this year if the pace stays the same.
I don't have an assigned district. Most of the special investigation units such as Homicide & Robbery office are countywide. General detectives are assigned to individual districts.
My worry isn't so much a hot scene. I'm usually last one there. Uniformed patrol will be on the scene before me 99% of the time. I serve warrants, though, and not everything qualifies for SWAT, even with major felonies. My bigger worry is ambush. My car is unmarked, but its pretty obvious its a police car if anyone really looks. I'm plain clothes, but not UC, so when I'm eating lunch and the like my radio is still talking on my belt, so even if you can't see my badge, gun, etc, again its pretty obvious I'm a cop. Those last two assholes who ambushed and murdered cops eating lunch were even from Indiana.
The faster I can get out of the holster and on target, the better my chances of surviving an ambush. If I can get under a second, I can pull and fire quick enough to interrupt most people's draw stroke.
The basic theory is the OODA loop. Observe, Orient, Decide, Act. You have to Observe the threat, as you can't react to something you are unaware of. You have to Orient yourself to this new information (go from "I'm eating lunch" to "i'm about to be in a gun fight"). You have to Decide what to do (take cover, draw, rush him, whatever) and then Act.
The bad guy has the drop on you, because he's already through OOD the moment he starts his attack. Situational awareness, reading people around you, etc. may allow you to catch him earlier in the cycle, but in the worst case he's at "A" while you're on the first "O". Shedding time on the "A" can get you back in the fight.