Defense Secretary Ash Carter speaks during a press conference following a change-of-command ceremony for the North American Aerospace Defense Command and U.S. Northern Command at Peterson Air Force Base, Colo., May 13, 2016. Air Force Gen. Lori J. Robinson, second from left, assumed command of NORAD and Northcom during the ceremony. Also pictured are, from left, Marine Corps Gen. Joe Dunford, chairman of the Joint Chiefs of Staff; Canadian Defense Minister Harjit Sajjan; and Canadian Army Gen. Jonathan Vance, chief of the Canadian defense staff.
DoD photo by Navy Petty Officer 2nd Class Dominique A. Pineiro
Defense Secretary Ash Carter hands the U.S. Northern Command flag to Air Force Gen. Lori J. Robinson during a change-of-command ceremony at Peterson Air Force Base, Colo., May 13, 2016. Carter presided as Robinson took command of North American Aerospace Defense Command and Northcom from Navy Adm. Bill Gortney. DoD photo by Air Force Senior Master Sgt. Adrian Cadiz
Navy Adm. Bill Gortney hands Defense Secretary Ash Carter a U.S. Northern Command flag during the change-of-command ceremony for the North American Aerospace Defense Command and Northcom at Peterson Air Force Base, Colo., May 13, 2016. Gortney relinquished command of NORAD and Northcom to Air Force Gen. Lori J. Robinson during the event. DoD photo by Air Force Senior Master Sgt. Adrian Cadiz
Defense Secretary Ash Carter autographs a Secretary of Defense Flag for the U.S. Air Force Academy parachute team in Colorado Springs, Colo., May 12, 2016. Senior Master Sgt. Adrian Cadiz
Defense Secretary Ash Carter listens to cadets talk about a training glider at the U.S. Air Force Academy in Colorado Springs, Colo., May 12, 2016. DoD photo by Air Force Senior Master Sgt. Adrian Cadiz
Defense Secretary Ash Carter answers questions posed by U.S. Air Force Academy cadets during a campus visit in Colorado Springs, Colo., May 12, 2016. DoD photo by Air Force Senior Master Sgt. Adrian Cadiz
Defense Secretary Ash Carter joins U.S. Air Force Academy cadets for lunch during a campus visit in Colorado Springs, Colo., May 12, 2016. DoD photo by Air Force Senior Master Sgt. Adrian Cadiz
Defense Secretary Ash Carter greets U.S. Air Force Academy cadets from the staff tower before he joins them for lunch in Colorado Springs, Colo., May 12, 2016. DoD photo by Air Force Senior Master Sgt. Adrian Cadiz
Defense Secretary Ash Carter walks with Air Force Lt. Gen. Michelle Johnson, superintendent of the U.S. Air Force Academy, upon arriving at the academy in Colorado Springs, Colo., May 12, 2016. DoD photo by Air Force Senior Master Sgt. Adrian Cadiz
Air Force Gen. John E. Hyten, commander of Air Force Space Command, greets Defense Secretary Ash Carter as Carter arrives at the Joint Interagency Combined Space Operations Center at Schriever Air Force Base, Colo., May 12, 2016. DoD photo by Air Force Senior Master Sgt. Adrian Cadiz
Navy Adm. Cecil D. Haney, commander of U.S. Strategic Command, greets Defense Secretary Ash Carter as Carter arrives at the Joint Interagency Combined Space Operations Center at Schriever Air Force Base, Colo., May 12, 2016. DoD photo by Air Force Senior Master Sgt. Adrian Cadiz
Defense Secretary Ash Carter delivers remarks during the National Security Telecommunications Advisory Committee meeting at Intel Corporation in Santa Clara, Calif., May 11, 2016. DoD photo by Air Force Senior Master Sgt. Adrian Cadiz
Defense Secretary Ash Carter walks with Homeland Security Secretary Jeh Johnson, center, and Commerce Secretary Penny Pritzker, right, as they make their way to a news conference during the National Security Telecommunications Advisory Committee meeting at Intel Corporation in Santa Clara, Calif., May 11, 2016. DoD photo by Air Force Senior Master Sgt. Adrian Cadiz
Defense Secretary Ash Carter sits in on a classroom discussion during a visit to Stanford University in Palo Alto, Calif., May 11, 2016. DoD photo by Air Force Senior Master Sgt. Adrian Cadiz
Defense Secretary Ash Carter, left, speaks former Secretary of State Condoleezza Rice and Stanford University President John Leroy Hennessy as he arrives at the Lou Henry Hoover House in Stanford, Calif., May 11, 2016, for a ceremony to honor former Secretary of State George P. Shultz. Carter presented Shultz. DoD photo by Air Force Senior Master Sgt. Adrian Cadiz
Defense Secretary Ash Carter conducts an interview with CNBS's Josh Lipton during a visit to Defense Innovation Unit Experimental in Mountain View, Calif., May 11, 2016. DoD photo by Air Force Senior Master Sgt. Adrian Cadiz
Defense Secretary Ash Carter, center right, speaks with Defense Innovation Unit Experimental leaders in Mountain View, Calif., May 11, 2016. DoD photo by Air Force Senior Master Sgt. Adrian Cadiz
Defense Secretary Ash Carter presents former Secretary of State George P. Shultz with the Innovators in Defense, Enterprise, Academia and Science award during a ceremony at the Lou Henry Hoover House in Stanford, Calif., May 11, 2016. DoD photo by Air Force Senior Master Sgt. Adrian Cadiz
Defense Secretary Ash Carter greets Air Force Chief Master Sgt. Steven J. Pyszka, command chief of the 129th Maintenance Group, as Air Force Col. Rosemary M. Smith, the unit's commander, looks on as he arrives at Moffett Field near Mountain View, Calif., May 10, 2016. Carter is scheduled to visit Defense Innovation Unit Experimental during a trip to California to continue his outreach to innovators in the technology sector. DoD photo by Air Force Senior Master Sgt. Adrian Cadiz
Defense Secretary Ash Carter speaks with Defense Innovation Unit Experimental employees in Mountain View, Calif., May 11, 2016. DoD photo by Air Force Senior Master Sgt. Adrian Cadiz
Defense Secretary Ash Carter shakes hands with Air Force Col. Rosemary M. Smith, commander of the 129th Maintenance Group, as he arrives at Moffett Field near Mountain View, Calif., May 10, 2016. Carter is scheduled to visit Defense Innovation Unit Experimental and the Silicon Valley. DoD photo by Air Force Senior Master Sgt. Adrian Cadiz