In nearly nine years of warfare in Afghanistan, U.S. Special Forces have done their fighting in the shadows, governed by rules largely of their own making. Now, these elite and secretive troops, their actions long shielded from public scrutiny, are the focus of a high-profile investigation that could shed unprecedented light on their methods and tactics. American and Afghan officials are probing a possible attempted coverup in the deaths of five Afghan civilians in February in a raid carried out by U.S. Special Forces accompanied by Afghan troops. Three of those killed were women and among the charges is that the bodies were tampered with by coalition forces to conceal the cause of death. Special Forces are inextricably linked to one of the most contentious issues between the Afghan government and Western forces: civilian deaths and injuries. Special Forces account for a disproportionate share of civilian casualties caused by Western troops ... though there are no precise figures because so many of their missions are deemed secret. In mountain villages and desert hamlets, the Special Forces inspire dread among Afghans, who tend to speak of them in whispers. Their strikes are usually swift and violent, most often taking place in the dead of night.