U.S. civil administrator in Iraq Paul Bremer (3nd L) is escorted by personnel from U.S. security contractor Blackwater on his arrival at U.S. Army 82nd Airborne Division headquarters in Ramadi in this March 11, 2004 file photo. Blackwater, which has received U.S. government contracts worth more than a billion dollars since 2001, is under intense scrutiny over its security work in Iraq, where its chief executive Erik Prince said the North Carolina firm had about 1,000 personnel. Blackwater defended its role in Iraq on October 2, 2007, but skeptical lawmakers took aim at the company over a series of incidents, including a Sept. 16 shooting that killed 11 Iraqis. REUTERS/Peter Andrews/Files (IRAQ)