As millions of German troops invade the Soviet Union during World War II, Soviet leader Joseph Stalin authorizes women to form the first female bomber regiments. These young female pilots and navigators fly the oldfashioned Polikarpov Po2 on night missions to attack enemy targets, earning them the German nickname of Nachthexen, or Night Witches. “Chronicles of Courage: Stories of Wartime and Innovation” is a coproduction of Vulcan Productions and NBC News Learn.