With the outbreak of the Korean War on June 25, 1950, the United Nations voted to send troops into South Korea to aid it against the North Korean Army to prevent the country from collapsing. Sebille's unit was among those sent to assist the UN ground forces operating in Korea. By the end of July, the US had shipped a large number of aircraft of all types to Korea. On July 30, the Far East Air Forces had 890 planes; 626 F-80's and 264 P-51's, but only 525 of them were in units and available and ready for combat.