During WWII, arms factories were considered vulnerable to Japanese attacks from the sea.

To thwart attacks from the air, many factories were camouflaged. One of these was a Douglas Aircraft factory in the Los Angeles area. Designed by motion picture set artists, and costing many millions of dollars, netting was strung over the factory, and bucolic countryside settings were constructed on the surface of the netting. Underneath the netting, the factory continued its work.

Tom was driven past a Douglas Aircraft factory on one of his weekends and describes it as very realistic.