NEW YORK TIMES BESTSELLER "An ode to excellence. An inspiring read for every American." -Robert M. Gates An extraordinary journey behind the scenes of Arlington National Cemetery, Senator Tom Cotton's Sacred Duty offers an intimate and inspiring portrait of "The Old Guard," the revered U.S. Army unit whose mission is to honor our country's fallen heroes on the most hallowed ground in America. Cotton was a platoon leader with the storied 3rd U.S....