oct 2, 1962 - Robert McNamara sends a memo to the JCS outlining six circumstances in which military action against Cuba may be necessary

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a. Soviet action against Western rights in Berlin...
b. Evidence that the Castro regime has permitted the positioning of bloc offensive weapons on Cuban soil or in Cuban harbors.
c. An attack against the Guantanamo Naval Base or against U.S. planes or vessels outside Cuban territorial air space or waters.
d. A substantial popular uprising in Cuba, the leaders of which request assistance...
e. Cuban armed assistance to subversion in other parts of the Western Hemisphere.
f. A decision by the President that the affairs in Cuba have reached a point inconsistent with continuing U.S. national security.McNamara asks that future military planning cover a variety of these contingencies, and place particular emphasis on plans that would assure that Fidel Castro is removed from power.