Hello,
Over the past weekend I visited the National Air Force Museum in Dayton, Ohio. An amazing place with over 360 full-size aircraft/missiles on display. Far too large to see in one afternoon.
One of the planes I walked through was President Eisenhower's personal plane for presidential trips. It is a Lockheed VC-121E. I was surprised to see this 16mm Victor (RCA?) projector on the plane: