American troops shot by Iraqi civil defense officers. Clearly they delayed on this because it lays bare so many of their false assumptions -- chiefly about their ability to distinguish democracy-minded freedom-loving Iraqis from jihadists. From [1] AP:

The Pentagon waited nine months after completing an investigation into the deaths of two U.S. soldiers before notifying relatives the men were killed by Iraqi troops, the military acknowledged Wednesday.

The June 2004 deaths of Army Spc. Patrick R. McCaffrey Sr., 34, of Tracy, and 2nd Lt. Andre D. Tyson, 33, of Riverside, were originally attributed to an ambush during a patrol near Balad, Iraq. The Army said this week a military investigation found the two had been shot by Iraqi civil defense officers. No possible motive has been divulged.