Senior Marine officers in Iraq apparently looked the other way after civilians (including women, childen, and an elderly person in a wheelchair) were murdered at the hands of American forces in Haditha, Iraq last year.
An investigation by Lt. Gen. Peter W. Chiarelli, the 2nd ranking American commander in Iraq, concludes that in the aftermath of the Haditha murders, senior officers failed to follow-up on inaccuracies and inconsistencies after the intial reporting of the incident. Apparently, there were inconsistencies that should have raised a red flag.
Also of note in Chiarelli's report: there was no effort to correct the record on how the civilians were really murdered. A military press release initally stated that the Iraqis died because of a roadside bomb; yet, there was no effort to follow-up and accurately report they died at the hands of U.S. marines.
I guess if you look the other way, it really hasn't happened. See no evil, hear no evil.