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TIKRIT, IRAQ: TO GO WITH AFP STORY 'IRAQ-US-HOME': US Army Sgt. 1st Class Gus Lalau from the 1-24 Signal Battalion, 4th Infantry Division, adjusts a radio in a humvee during a practice convoy 19 February 2004 at a former palace of ousted president Saddam Hussein in Tikrit, 180 kms (110 miles) north of Baghdad. Nearly a year after its invasion of Iraq, the US military is not only replacing about 100,000 troops that took part in the original occupation, but is also rotating most of their equipment in one of the biggest logistical exercises it has ever undertaken. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)

TIKRIT, IRAQ:  TO GO WITH AFP STORY 'IRAQ-US-HOME': US Army Sgt. 1st Class Gus Lalau from the 1-24 Signal Battalion, 4th Infantry Division, adjusts a radio in a humvee during a practice convoy 19 February 2004 at a former palace of ousted president Saddam Hussein in Tikrit, 180 kms (110 miles) north of Baghdad. Nearly a year after its invasion of Iraq, the US military is not only replacing about 100,000 troops that took part in the original occupation, but is also rotating most of their equipment in one of the biggest logistical exercises it has ever undertaken.   AFP PHOTO/Stan HONDA  (Photo credit should read STAN HONDA/AFP/Getty Images)