Photograph of two jets connected to sound abatement devices, ca.1960. At center, two U.S. Air Force jets can be seen connected to two large cylindrical vats. Both jets have their wings slightly retracted and hoods lifted. Additionally, the cockpit covering is open on both revealing the interior of the jet. Several ladders can be seen next to the planes, and a large wheeled cage stands in front of each plane. A large cylindrical vat is visible behind each of the jets. The vat has a small hole in its front where the engine of the plane appears to be inserted. Large pipes can be seen extending from the top of these vats. In the background, a series of lights and cylindrical towers can be seen. A description on the photoprint reads: "Jet aircraft sound abatement devices. North American Aviation, Incorporated. El Segundo, California".