- Date of birth:
- February 26th, 1918 (Großefehn/Hannover, Germany)
- Date of death:
- December 13th, 1976 (Ostgroßefehn/Lowersaxony, Germany)
- German (1933-1945, German Reich)
Johann Heyen finally reached the rank of Hauptmann der Reserve.
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- Second World War (1939-1945)
- Oberleutnant der Reserve (1st Lieutenant of Reserves)
- Chef 4.(M.G.) / Grenadier-Regiment 377
- Awarded on:
- August 27th, 1944