It doesn't say which one; there were several Marine-Bordflak-Abteilungen, but since he was KIA in the Mediterranean Sea in Dec. 1942, I would say it has to be Marine-Bordflak-Abteilung Süd (raised in 1941, staff based at Naples, Italy). On 1 June 1943, it was split into the 1. Marine-Bordflak-Abteilung Süd (staff moved from Naples to Genoa-Nervi) and the 2. Marine-Bordflak-Abteilung Süd (staff moved from Naples to Castellammare).
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