FALLUJAH, IRAQ:  Lieutenant Colonel Gregg Olson (L), from 2nd Battalion, 1st Marines, walks in front of his Abrams tank as it takes  position on the highway at the main entrance of Sunni Muslim flashpoint town of Fallujah, 50kms west of Baghdad, 24 June 2004.  A US Cobra helicopter was shot down near Fallujah after insurgents opened fire with rocket-propelled grenades, mortars and machine-guns at 7:30 AM local time. According to a marine officer, 15 Iraqis were killed, a few marines were wounded and some 200 US marines were involved in the operation.   AFP PHOTO/Mauricio LIMA  (Photo credit should read MAURICIO LIMA/AFP via Getty Images)