Task: Question Generation
Input (English): Context : Gerhard Bielig (28 April 1916 -- 29 September 2004) was a German U-boat engineer (Ing.) in World War II and recipient of the Knight's Cross of the Iron Cross (German: Ritterkreuz des Eisernen Kreuzes). 
Answer : World War II
Output (English): In which war did Gerhard Bielig serve?