Before he was President, Eisenhower was a general. What war was he in?

Why this is the answer

World War II. Dwight D. Eisenhower served as a major general in that war, commanding U.S. forces and serving as supreme commander of the Allies in Europe, where he led the D-Day invasion of Normandy on June 6, 1944. He retired from active service in 1952 and was elected president later the same year, taking office in 1953 as the 34th president. The trap in this question is the Korean War: he oversaw its end, but as president, not as a general. As president he also established the interstate highway system, and he left office in 1961 after two terms. Memory hook: general in the Second World War, president during the end of Korea.