<snip> I understand the cross talk between agencies, I've worked with both the FBI and CIA and neither spoke highly of the other. <snip>
Lord love a duck, so right on!
My personal bad experience was with DIA and embassies (they claim that as their bailiwick) as a DMA Regional Analyst. Working by e-mail (never returned my calls or answered phone) led to some syntax errors and she was forever in a snit after that and never did accept my apology for the confusion. Soured me on dealing with them to this day. Silly? Yes, but just being honest about human foible in service to country. In my own defense that was a common problem between the two agencies back in the late 20th century. Heaven help you if you pointed out a country had a new address for one of their embassies on their national web site - "Well,
we have no confirmation on
that address, use our location."

Bureaucrats! I am one and it drives me crazy!
I can see "clan" issues (for lack of a better term - within the setting) causing problems between units/individuals on a common force. It's not so black and white as labels might suggest.
So I see the Cops/criminal/SWAT/etc. derivation as a way to generalize the species/races/whatever but I will point out that mixing them is far more useful and leads to some great story lines.
Gracias,
Glenn