On October 21, 1962, an agreement was reached by the ExComm after much debate, to place a "Quarantine" around Cuba, in order to prevent more Soviet Missiles from being delivered. <ref name="thinkquest2">http://library.thinkquest.org/11046/days/timeline.html</ref>The quarantine was established at a perimeter of 800 miles around Cuba, to search and reject any ships containing nuclear missiles. The call for a quarantine was a difficult one to make, because a blockade was technically an act of war, and needed caution to avoid a misunderstanding. At a later time, the quarantine line was moved back to 500 miles around Cuba<ref name="thinkquest2"/>, to provide more time for the United States and the Soviet Union to communicate.
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In analyzing the Cuban Missile Crisis, it has been said that the quarantine was meant to be a form of communication, rather than a method of eliminating the missiles, as enough had already been delivered as to cause concern to the United States.