Operation Nickel Grass was a strategic airlift operation conducted by the United States to deliver weapons and supplies to Israel during the 1973 Yom Kippur War. Over 32 days, the United States Air Force Military Airlift Command (MAC) shipped 22,325 tons of tanks, artillery, ammunition and supplies in C-141 Starlifter and C-5 Galaxy transport aircraft between 14 October and 14 November 1973. The U.S. support helped ensure that the State of Israel survived a coordinated and surprise attack from the Soviet-backed Arab Republic of Egypt and Syrian Arab Republic.