ABC News(NEW YORK) -- Prince Harry writes in his new memoir Spare that he killed 25 Taliban fighters during his second tour of Afghanistan, according to reporting from news outlets that obtained the book ahead of its official Jan. 10 release. The reported revelation marks the first time that Harry, the duke of Sussex, has discussed the number of people he says he personally killed during his military service. Harry, 38, served as a British Army officer for 10 years. Known as Capt. Harry Wales in the Army, he was deployed to Afghanistan twice, from 2007 to 2008 and then again from 2012 to 2013....