Scenes from WWII show what the Second World War looked like in different cities and countries around the world. | National Geographic TV

Integrating more than 1,000 hours of rare archival footage and photos and the airmen’s own words, Heroes of the Sky: The Mighty Eighth Air Force takes viewers back to the pivotal moments when the Mighty Eighth shifted the Allies fate in World War II. Watch tonight at 9/8c. | National Geographic TV

The Air Force is the youngest branch of the U.S. Military, and in WW2 was part of the U.S. Army. | National Geographic TV