FILE - In this Sunday, Feb. 24, 1991 file photo, Kuwaiti troops wearing gas masks and protective suits as they roll through southern Kuwait in an armed motor convoy, the first full day of ground conflict in Operation Desert Storm. Allied troops encountered resistance in some areas, but no use of gas weapons was reported. Inverted "V" painted on vehicles is the allied recognition symbol. In February 1991, after months of building an international coalition, U.S. forces entered Kuwait to end the Iraqi occupation of its smaller, oil-rich neighbor. (AP Photo/Laurent Rebours, File)