The North American XB-70 Valkyrie is rolled out at Palmdale, Calif. Designed to fly at three times the speed of sound and at altitudes above 70,000 feet, the XB-70 is originally planned as a manned bomber, but funding limitations allow for only two aircraft, to be used strictly for testing and research.
The Air Force may wind up buying land to build 120 new intercontinental ballistic missile silos as part of its revamped infrastructure approach for the new Sentinel ICBM.