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Military milestone. u.s. combat troops leave iraq. the relieved soldiers and the pentagon's strategy. then, battlegrounds near new york's ground zero. why the debate over a planned islamic center is now intensifying. and, pet project. >> maybe she could get a mouse. >> the lessons from dogs. it's thursday, august 19th. >> from abc news, this is "world news now." >> and good morning, i'm rob nelson. >> i'm vinita nair. thousands of u.s. soldiers have crossed the border from iraq to kuwait this morning. it is the last american combat brigade to leave iraq.

Catered event. >> similar incidents were being discovered in other parts of the country. >> reporter: normally eggs become contaminated with salmonella through rodent droppings or other unsanitary conditions. in this strain the hens' ovaries become infected, passing the bacteria on inside the egg. >> the birds themselves aren't sick so the farmer doesn't even know what's going on. and in the meantime, it's producing eggs that look clean and fine. >> reporter: ironically, the fda just issued strict new guidelines for farmers designed to prevent salmonella outbreaks. those regulations took effec...

For him, where it's a source of joy for most of us. incredible story. >> definitely stick around for that one. good morning and thanks for being with us. i'm vinita nair. >> i'm rob nelson. the war in iraq has now passed a major milestone. the last u.s. combat brigade has now left that country. >> after more than seven years, members of the 4th stryker brigade 2nd infantry are heading home. t.j. winick reports on the future of u.s. involvement in iraq. good morning, t.j. >> reporter: good morning, rob and vinita. to be clear, the combat operation is not over until the end of august when the ...

Hotbed of the insurgency during the surge of 2007. >> kind of mixed feelings about it. because we're going home. you know. and -- i mean, in spite of what everybody says, we are kind of making history here. >> reporter: president obama had set august 31st as the deadline for ending american combat operations in iraq. although the last combat brigade has left, the official combat mission will not end for another couple of weeks. >> our commitment in iraq is changing from a military effort led by our troops to a civilian effort led by our diplomats. >> reporter: 50,000 u.s. troops will remain in...

Display a huge american flag. after nearly seven and a half years in iraq, the men and women of the 4th stryker brigade 2nd infantry division have shipped out. >> immense, immense relief. it's over. it's all over for us. >> kind of mixed feelings about it. because we're going home. you know. and -- i mean, in spite of what everybody says, we are kind of making history here. >> 50,000 troops will stay in iraq. among their duties, training iraq's military and police forces. the north carolina state crime lab is under the microscope this morning after investigators discovered tainted evidence. ...