If you still haven't watched any of the million documentaries about the Iraq War because you're still not quite ready for that kind of subject matter, you might want to check out Full Battle Rattle. It is a documentary, and it is related to the Iraq War, but you may consider it more like a simulation of a documentary about the Iraq War than an actual example. Think of it as like a practice piece until you can handle the real deal.
How is Full Battle Rattle different from the rest, you ask? Well, it's not set in Iraq or even in the Middle East. It takes place in America, in California's Mojave Desert, to be exact. It's there that the U.S. military has built a bunch of fake Iraqi towns, complete with fake Iraqi people, some of whom are played by actual Iraqi immigrants, others of whom are played by soldiers preparing for combat before being deployed overseas.
And then there are the other thousands of soldiers who basically play themselves on the unscripted side of partially scripted training exercises designed to simulate possible scenarios that they'll be faced with once they're shipped out to Iraq. In a way, watching the simulations documented in the film is like watching Civil War reenactments, except that in this case it's more like pre-enactments.