Task: Question Generation
Input (English): Context : The Fiat L6/40 was a light tank used by the Italian army from 1940 through World War II. It was designed by Fiat-Ansaldo as an export product, and was adopted by the Italian Army when officials learned of the design and expressed interest. 
Subject : Fiat L6/40 
Relation : service entry
Output (English): In what year did Fiat L6/40 enter service?