I work for a Federal agency that primarily operates overseas. I've been to Iraq twice and Afghanistan four times. As far as the attitude/mindset thing, I agree that many (NOT all) LEOs who only have domestic law enforcement experience don't quite "get it" when it comes to operating in an environment like Iraq. We experienced quite a bit of institutional resistance, for example, when we tried to introduce belt-fed machine guns into our protective motorcades. Many of our "silverbacks" stuck to this "we are law enforcement, we can't shoot full-auto weapons, we have to account for every round" mentality, until a number of "traditional" two-suburban-agents-with-M4s-and/or-submachineguns-type motorcades from other agencies got ambushed and destroyed in a short period of time. Most of the former military guys, conversely, just kind of intuitively understood that doing protective motorcades in Iraq was not the same thing as doing VIP protection or criminal investigations in Miami or Los Angeles or New York. (My background prior to becoming a Federal agent was military--Army Infantry--so my opinion on this may not be entirely unbiased).
As far as the risks, to police trainers or anyone else, by far the most dangerous thing most people do in Iraq on any given day is drive around on the highways (aka, "IED Alleys"). The IED threat is off the hook, the IEDs are enormous and getting more sophisticated, and if your convoy/motorcade gets hit, your training, experience, job title, armament, etc., don't really count for much. Basically, if it's your time, it's your time.
It's been almost two years since my last Iraq deployment (in my current assignment, I do not deploy overseas), and I've got the strangest and most irresistible jones to go back. It really bothers me that there are American soldiers, marines, airmen, sailors and, yes, law enforcement officers, diplomats, contractors, etc., in harm's way in Iraq (and Afghanistan, and elsewhere), while I am sitting fat and happy and safe here in CONUS. I feel guilty. Two agents from my agency have been killed in the line of duty in Iraq since the last time I was there, so I guess I should just count my blessings...