For some time, the United States had had an emergency plan to attack Israel, a plan updated just prior to the 1967 war, aimed at preventing Israel from expanding westward, into Sinai, or eastward, into the West Bank.
In May 1967, one of the U.S. commands was charged with the task of removing the plan from the safe, refreshing it and preparing for an order to go into action.
This unknown aspect of the war was revealed in what was originally a top-secret study conducted by the Institute for Defense Analyses in Washington. The full story is detailed in Haaretz' Independence Day Supplement.
In February 1968, an institute expert, L. Weinstein, wrote an article called "Critical Incident No. 14," about the U.S. involvement in the Middle East crisis of May-June 1967.Only 30 copies of his study were printed for distribution. Years later the material was declassified and can now be read by everyone, although details that are liable to give away sources' identities and operational ideas have remained censored.
Strike Command, the entity that was to have launched the attack on Israel, no longer exists. It was annulled in 1971 for domestic American reasons and superseded by Readiness Command, which was abolished in the 1980s in favor of Central Command (CENTCOM) which today includes forces in Iraq, Iran, Syria, Lebanon, Egypt, Jordan and Afghanistan; and the Special Operations Command (SOCOM).
http://www.haaretz.com/hasen/spages/851708.html