sentences:  After his graduation in 1934, he served a short time in the Dutch East Indies before he entered service in the Royal Netherlands Navy Submarine Service.On 13 May 1940, De Jong sailed to England on board the Dutch HNLMS "O 24" and during World War II he saw action initially as first officer and from mid-1944 onwards as Commanding officer of that vessel.He lived in England during the World War II.