The acting head of the Transportation Security Administration was reassigned Monday after an internal investigation by the Department of Homeland Security found security failures at dozens of the nation's busiest airports. The breaches allowed undercover investigators to smuggle weapons, fake explosives and other contraband through numerous checkpoints. Melvin Carraway, an 11-year veteran of the TSA who became acting administrator in January, was immediately reassigned to job coordinating DHS programs with local law enforcement agencies, DHS Secretary Jeh Johnson said Monday night. Coast Guard Vice Adm. Pete Neffenger's nomination to be permanent administrator is awaiting Senate confirmation. Upon learning the initial...