American aircraft and warships begin heavy, sustained attacks on North Vietnam for the first time since the cessation of bombing in October 1968.
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…