At 12:06 p.m. the sirens in Washington began their drawn-out wail, warning that "enemy H-bombers'' were approaching the capital as part of the fourth nationwide civil defense test, "Operation Alert 1957." Like millions of other Americans in major cities across the U.S., the President of the U.S. was ready to play his part in the nuclear-age fire drill. At 2:10 p.m., hatless, wearing a tan, double-breasted summer suit, he walked across the White House's south lawn, and for the first time boarded his new royal-blue and white Bell Ranger helicopter.* Serious of...

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