This educational video explains aircraft defense technology and operations on Boeing B-17 airplanes. HOW IT WORKS playlist: https://www.youtube.com/watch?v=4rIHdcwlvlk&list=PLCIsViWU6sLkATemOAURLlP0GK4-dyHRm FOLLOW on: https://twitter.com/DocArchive https://www.facebook.com/documentarytube.net