SAMARRA - AUGUST 21: U.S. Army 4th Infantry Division 1-12 soldiers scan rooftops as they conduct a night patrol of the city center in Samarra, Iraq. U.S. soldiers in Samarra come under frequent ambush attack by rocket propelled grenades, small arms and improvised explosive devices. (Photo by Scott Nelson/Getty Images)

SAMARRA - AUGUST 21: U.S. Army 4th Infantry Division 1-12 soldiers scan rooftops as they conduct a night patrol of the city center in Samarra, Iraq. U.S. soldiers in Samarra come under frequent ambush attack by rocket propelled grenades, small arms and improvised explosive devices. (Photo by Scott Nelson/Getty Images)