Word: alertly
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Dates: during 1950-1959
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...inaudible "yellow" alert will summon civil defense personnel to their positions. At 9:35 the "red" alert, a series of short siren blasts continuing for three minutes, will call the public to participate in the drill...
...clear "white" alert, three one minute blasts at two minute intervals, will end the drill...
...yellow alert" will sound, calling Civil Defense personnel to their positions. Twenty minutes later the "red alert," a series of short siren blasts for a period of three minutes, will sound the first signal calling for public response...
...white alert," three one minute blasts sounded at two minute intervals, will announce the all-clear. At this time the public may resume its usual activities...
Students in class at the time of the test will remain in class. Classes will continue as usual. Students not in class at alert time will follow the same procedure as outlined for the public...