(Editor's Note: This story has been updated to reflect additional information received subsequent to publication.) Defense Secretary Jim Mattis recently named U.S. Strategic Command chief Gen. John Hyten the sole person responsible for overseeing nuclear command, control and communications, Hyten said at a July 13 Mitchell Institute conference. While the head of STRATCOM is already responsible for operational command and control of the nuclear enterprise's strategic forces, the new directive allows for greater oversight over NC3 operations, requirements and...