Where was The Steel Helmet filmed?
1951 film directed by Samuel Fuller
The Steel Helmet (1951) was filmed in Griffith Park, 1 place named in its Wikipedia article's Production section, in the United States. Wikidata records no filming location for it at all, so the article is the only recorded source. Each place says where its claim comes from.
Places per Wikipedia's Production section
Wikipedia’s Production section names 1 place. Each links to the sentence that says so.
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Landscapes & nature
Griffith Park
United States
Municipal park in the Los Feliz neighborhood of Los Angeles, California, United States
“Exteriors were shot in Griffith Park, with 25 UCLA students hired as extras.” Wikipedia