PETERSON SPACE FORCE BASE, Colo.—The United States is testing satellite resiliency to threats from China and Russia miles above the earth’s surface, just weeks after Russia shot down an aging communications satellite. The computer-aided simulations included potential shooting down of U.S. missile-tracking satellites, satellite jamming, and other electronic warfare “effects” that are possible tactics in space warfare. Actual satellites are not used. During a visit to Schriever Space Force Base in Colorado, Deputy Secretary of Defense Kathleen Hicks saw the ‘Space Flag’ simulated space training exercise hosted by U.S. forces. It was the 13th such exercise, and the third to involve partners such as Britain, Canada, and Australia. “It happens in rooms like that … people at a relatively junior level in many cases. Collaborating and thinking through challenges and trying to figure out concepts that seem to make sense and discarding ideas that go astray,” Hicks told reporters en …