Afghan Interpreters Were Invaluable To American Troops During Two Decades Of War. Now That U.S. Forces Are Pulling Out, Afghans Who Aided Americans Fear For Their Lives. As The U.S. Government Processes Thousands Of Visa Applications To Allow Them To Emigrate, Voa's Carolyn Presutti Has The Exclusive Story Of Two Former Interpreters Who Say They Are In Grave Danger.