Beginning on Feb. 20, 1944, and lasting through Feb. 25, 1944, the United States Strategic Air Forces (USSTAF) launched a series of missions against the Third Reich that became known as “Big Week.” In six days, the Eighth Air Force bombers based in England flew more than 3,000 sorties and the Fifteenth Air Force based in Italy more than 500. Together they dropped roughly 10,000 tons of bombs. The daylight bombing campaign was also supported by RAF Bomber Command operating against the same targets at night. The campaign helped the Allies achieve air superiority, so the invasion of Europe could proceed. While U.S. industrial might could entirely replace losses during the “Big Week,” Germany was unable to do so.