Ships
- HNLMS Jacob van Heemskerck (D20) Commander from 15 September 1944 · Relieved on 15 October 1945
Jonkheer Gustaaf Alexander Berg had Jacob van Heemskerck from 15 September 1944 until 15 October 1945. Uboat.net lists him as kapitein-luitenant ter zee, which it glosses as commander. The Dutch history calls him Commander. The English rank Commander comes from that gloss and from the Dutch history. He was not a captain in this command.
Uboat.net records that he was born on 13 June 1896 at Hilversum and died on 16 March 1951 at Laren.
The rank table lists luitenant ter zee der 3e klasse, glossed sub-lieutenant, on 16 August 1919; luitenant ter zee der 2e klasse, glossed lieutenant, on 16 August 1921; luitenant ter zee der 1e klasse, glossed lieutenant-commander, on 1 September 1930; and kapitein-luitenant ter zee, glossed commander, on 15 November 1941. He retired on 16 June 1946. The page says it has no career narrative.
He took her on 15 September 1944, during the Liverpool overhaul. Trials were run on the Mersey on 16 and 17 July 1945. The refit finished on 21 July, and on 26 July she entered Amsterdam. The Dutch history calls her the first Dutch warship to enter a Dutch port after the war. On 15 September 1945 she left with Van Galen for the Netherlands East Indies. His uboat.net command continues to 15 October 1945, a month after that sailing. The pages do not say whether he was still aboard on 15 September 1945. They only date the command to 15 October.
He retired on 16 June 1946. He died at Laren on 16 March 1951.