Task: Question Answering
Input (English): Context : Being one of the key figures of the North Vietnam armed forces in Vietnam War, Lê Trọng Tấn was Deputy Commander of the Viet Cong and second commander of the 1975 Spring Offensive that effectively ended the war. 
Question : What was the war that Lê Trọng Tấn fought in?
Output (English): Vietnam War