PatTillmangaveuphisprofessionalfootballcareertojointheArmyRangersin2002—andbecameaninstantsymbolofpatrioticfervorandunflinchingduty.ButthetruthaboutPatTillmanisfarmorecomplex,andultimatelymoreheroic,thanthecaricaturecreatedbythemedia.Andwh…