Task: Question Generation
Input (English): Context : Waldemar Mehl (7 September 1914 in Grävenwiesbach, Hesse--29 March 1996 in Wiesbaden) was a German U-boat commander during World War II, and recipient of the (German: Ritterkreuz des Eisernen Kreuzes). 
Answer : World War II
Output (English): What war was Waldemar Mehl in?