Son of Mr. T. S. de Kock. His brother also died in service. ref. "The Silent War" by Peter Stiff. Border War DVD has more about that "Operation Candlelight" in it. The implication in there was that there was not much of a body to recover after the explosion, and the recces withdrew in a hurry. He was also known as "Kokkie"
LG Sup 31 July 1945 pg. 3926 - "This officer has displayed the highest standard of efficiency and courage. He has completed a very large number of sorties including many reconnaissances. In April 1945, Lieutenant de Jongh was leading a formation of a strafing reconnaissance. A convoy of motor transport was observed in the Montebelluno area. Despite adverse weather and heavy enemy opposition, this officer led the formation into attack. Twelve of the enemy vehicles were subsequently destroyed and a further three damaged. In air fighting Lieutenant de Jongh has been responsible for the destruction of at least one enemy fighter and has damaged others."