President John F. Kennedy departs for Washington followed by his...

President John F. Kennedy departs for Washington followed by his military aide, Major General Chester V. Clifton in West Palm Beach, Fla. (Jan. 5, 1961) Credit: AP

There is something oddly comforting in the routine they convey, however: The head of government has been toppled, but pilots still have to calculate headings to get the plane back to Andrews Air Force Base. The other tapes of that day reveal a considerable degree of professionalism on the ground, too. Hell has broken loose, but radio reporters can still find one last dime in their pocket to plug into a pay phone that miraculously appears out of the human chaos. Police dispatches, too, are precise and to the point. Words, and emotions, are not wasted. Something terrible has happened at Dealey Plaza -- send backup.

Nor were they given to speculation in those early moments. When someone at the Dallas Trade Mart -- where Kennedy was scheduled to speak -- asks the Dallas police chief, Jesse Curry, if the president might still keep his engagement, Curry says: "Very doubtful. Very doubtful."

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