A routine bomber flight in the pre-dawn hours of Oct. 24, 1968, turned unforgettable for navigator Patrick McCaslin.

McCaslin and his B-52 crewmates were practicing maneuvers in the skies above Minot, N.D., when officials at the nearby Air Force base radioed a request.

“The tower called and said, ‘Could you guys keep your eyes open for anything unusual?’ ’’ said McCaslin, recalling that flight four decades ago.

“We asked, ‘What are we looking for?’

“They said, ‘You’ll know it if you see it,’ ’’ McCaslin said.

“This is a dim memory,” he added, “but I think one of the pilots said, ‘Are the missile crews seeing things again?’ ’’

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