With NASA test pilot William H. Dana at the controls, the North American X-15 makes the type’s 199th and final flight, completing 10 years of flight testing at Edwards AFB, Calif. The airplane reaches a speed of Mach 5.04 and an altitude of 250,000 feet.
The cost of the nuclear AGM-181 Long-Range Stand Off missile has come down slightly and the program is on track, but several technologies it relies on are still considered immature, the Government Accountability Office found in a report. Meanwhile, the GAO also assessed the LGM-35A Sentinel intercontinental ballistic missile as…