 Complete the following phrase:  On 3 September 1950, Sergeant Bill Harrop was forced down behind enemy lines and executed by the North Koreans. Six days later, Spence was killed when his Mustang failed to pull out of a dive during a napalm attack on Angang-ni. His death was a serious blow to the squadron, and the RAAF despatched Cresswell on his third tour as commanding officer to replace him. Cresswell arrived at Iwakuni on 17 September and set about restoring morale, undertaking four sorties on his first day of operations three days later. MacArthur had meanwhile launched an 