A hidden aircraft factory in Burbank California during World War II:
Related (possibly apocryphal) story:
Well aware that the Lockheed aircraft plant in Burbank, just blocks from his studio, was certain to be a high-value target, [Jack Warner] was horrified one day to have someone point out that, from the air, a Japanese bomber might not be able to tell the difference. Warner promptly visited the studio’s paint shop and ordered the erection of an enormous sign on the roof of one of the Warner soundstages. The result? A twenty-foot arrow pointing to Burbank, along with the words: LOCKHEED – THAT-A-WAY!
[Thanks Damian]
Mick Hartley 
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