What is "excomm"

The Executive Committee of the National Security Council (commonly referred to as simply the Executive Committee or ExComm) was a body of United States government officials that convened to advise President John F. Kennedy during the Cuban Missile Crisis in 1962. It was composed of the regular members of the National Security Council, along with other men whose advice the President deemed useful during the crisis. EXCOMM was formally established by National Security Action Memorandum 196 on October 22, 1962. It was made up of twelve full members in addition to the president. Advisers frequently sat in on the meetings, which were held in the Cabinet Room of the White House's West Wing and secretly recorded by tape machines activated by Kennedy. None of the other committee members knew the meetings were being recorded, save for possibly the president's brother, Attorney General Robert F. Kennedy.