Messages about bombs, ammunition and emergencies offered a regular reminder of the plane's glorious, if incredibly dangerous, past.
For Mr. Callen, the ringing telephone has become a death rattle, a regular reminder of his own mortality.
Agency officials said the measure was necessary in light of the regular reminders this summer of the potential for tragedy when sharks and people collide.
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There were too many regular reminders in routine police work for him to have managed to wipe Alison Carter from the easily accessible area of his memory.
Near dusk each evening, the general alarm sounded, a regular reminder of the danger of Japanese air raiders.
Canceled flights and delayed mail serve as regular reminders that nature and not man is really in charge.
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They also got regular reminders or refresher classes to make sure their technique was correct.
Seeing them in his reflection was a regular reminder he wished to maintain.