Air Force Gen. John E. Hyten, the commander of U.S. Strategic Command, addresses an Association of the United States Army discussion on Army air and missile defense in Arlington, Va., Feb. 28, 2018. Hyten said his command’s top priority is deterring the use of nuclear weapons, preventing the use of those weapons against the United States and its allies, and preventing a catastrophic space or cyberspace activity. DoD photo by Lisa Ferdinando