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While memorial day stands as a tribute to fallen soldiers we're also aware of the men and women who serve and come back with scars, physical and emotional. tonight, dr. marc siegel looks at new ways to diagnose and treat one of our veterans' most insidious ailments. >> reporter: up to 20% of iraq and afghanistan veterans are suffering from post-traumatic stress. unlike other illnesses, we don't have a method to diagnose and treat it. >> the best thing we can do at the moment is to take a careful history and explore with the returning war fighters their current function. >> reporter: the cowen ...

While memorial day stands as a tribute to fallen soldiers we're also aware of the men and women who serve and come back with scars, physical and emotional. tonight, dr. marc siegel looks at new ways to diagnose and treat one of our veterans' most insidious ailments. >> reporter: up to 20% of iraq and afghanistan veterans are suffering from post-traumatic stress. unlike other illnesses, we don't have a method to diagnose and treat it. >> the best thing we can do at the moment is to take a careful history and explore with the returning war fighters their current function. >> reporter: the cowen ...