US Vice President Joe Biden shakes hands with an US soldier following a US Naturalization ceremony at the al-Faw Palace, a former residence of executed Iraqi president Saddam Hussein on the western outskirts of the capital Baghdad, on July 04, 2009. Some 237 soldiers from 59 countries swore allegiance to the flag. Getty Images logo Getty Images 31 months ago

US Vice President Joe Biden shakes hands with an US soldier following a US Naturalization ceremony at the al-Faw Palace, a former residence of executed Iraqi president Saddam Hussein on the western outskirts of the capital Baghdad, on July 04, 2009. Some 237 soldiers from 59 countries swore allegiance to the flag.