Museum restoration crews and 88th ABW civil engineers work to install the upper turret of the B-17F Memphis Belle™ in preparation for the exhibit opening. Plans call for the aircraft to be on public display here at the National Museum of the U.S. Air Force on May 17, 2018. – National Museum of the US Air Force

U.S. Air Force video by Ken LaRock-NMUSAF Public Affairs Division

The ball turret of the B-17F Memphis Belle in the restoration hangar at the National Museum of the U.S. Air Force

Featured image of the ball turret of the B-17F “Memphis Belle” in the restoration hangar at the National Museum of the U.S. Air Force