DEFCON Level October 6th, 1973: Yom Kippur War
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DEFCON 3 was reached on October 6th, 1973. During the Yom Kippur war after Syria and Egypt launched an attack on Israel.
The Strategic Air Command, European Command, Sixth Fleet and US Military were all raised to DEFCON level 3 for a few days time after receiving reports that Russia had a ship on its way to Egypt carrying nuclear warheads.