Uh, yeah... ICS is an interesting game here too. Mostly though when it comes to searches, WE are the ones who have experience running searches so we're able to convince the "Paid" folks that we're the best resources for the IC team. We have several folks who do a great job being IC and when they show up most other agencies either defer or create a unified command with us. Actually, the Park Service is the worst at letting go the reigns even though, surprisingly, most of them are way less qualified at running searches. The FD is next in line because IC originated with the FD and therefore they still feel like they own it. The 212th are Feds so we can't even participate... they keep to themselves. The Troopers will usually let us step in once their CO tells them they have to (since we are part of the Troopers), and all the other search groups tend to be grateful when we show up. Yes, IC can get interesting.
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YMMV. Viewer discretion is advised.