Hans-Joachim Merks entered in 1937 in the II. Schiffsstammabteilung der Ostsee.
He was trained on board of the "Gorch Fock" and the "Schleswig-Holstein".
After different training courses he was transferred in 1941 to the minesweepers and was Kommandant of the "R 33" and the "R 34".
After beeing WIA in 1944 he was Kommandant of the "M 104" and after January 1945 he was promoted Flottillenchef der 2.Räumboots-Flottille.
3rd April 1937 : Offiziersanwärter
21st September 1937 : Seekadett
1st May 1938 : Fähnrich zur See
1st July 1939 : Oberfähnrich zur See
1st August 1939 : Leutnant zur See
1st September 1941 : Oberleutnant zur See
1st April 1944 : Kapitänleutnant zur See
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