sentences:  In another interview, the centenarian talked about genetics, exercise, and a healthy diet, but put "the will to survive" above everything else.Buckles joined actor Gary Sinise in 2007 to lead a Memorial Day parade, and that evening his life was featured on "NBC Nightly News".With the death of 108-year-old Harry Richard Landis in February 2008, Buckles became the last surviving American veteran of World War I.