Word: occur
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Dates: during 1960-1969
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...Extend federal enforcement to the face of the mine, the area of digging where many of the deaths occur...
...Russians do indeed plan to steal the limelight from Apollo 8, their best opportunity for launching a manned circumlunar shot will occur during a brief period beginning around the first week in December. At that time, a spacecraft could be launched in daylight, streak around the moon, and return for a landing in Russia or the Indian Ocean during daylight hours, when it is easier to locate and reach the downed craft. The mission almost certainly will follow closely the trail of Zond-5 and Zond-6, the first craft to circle the moon and return safely to earth...
...matter how carefully it is planned and executed, however, the December flight of Apollo 8 will involve some chilling perils. Besides anticipating the kinds of problems that could occur in a simple near-earth orbital flight, lunar-mission planners must plan realistically for troubles that would be magnified by sheer distance from earth. Should life-support or power systems begin to fail on earth-orbital flights, astronauts are usually within half an hour to three hours of recovery on land or water; a relatively small thrust from a retrorocket can lower their orbit into the atmosphere, where friction provides...
Another tragedy that could occur during Apollo 8 Flight Director Clifford Charlesworth calls the mission's "longest hour." If, after completion of Apollo's tenth lunar revolution, the SPS engine fails to ignite or burns for too short a time, the astronauts would be stranded in orbit without any chance of rescue; they could live only until their oxygen supply was gone. To minimize the possibility of SPS failure, NASA has made nearly all of the engine's components redundant. If one part were to fail, a duplicate would be on hand to take over...
...create new types of ROTC programs, and if Harvard were to demand a radical restructuring of the ROTC units here, it would be told to put up with the present system (perhaps with very minor changes) or else to get out of ROTC altogether. If this were to occur--as it probably would--would the supporters of the HUC-SFAC proposals continue to support Harvard students' right to have ROTC on campus, at the price of abandoning their plans for reform? Or would they, as seems more likely, be willing to admit that the "right" to receive military training within...