Where was Halls of Montezuma filmed?
1951 film by Lewis Milestone
Halls of Montezuma (1951) was filmed in Marine Corps Base Camp Pendleton, 1 place named in its Wikipedia article, 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 article
The Wikipedia article names 1 place. Each links to the sentence that says so.
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Landmarks & buildings
Marine Corps Base Camp Pendleton
United States
US Marine Corps base near Oceanside, California, United States
“Real color combat footage from the war in the Pacific was incorporated into the film's cinematography, and scenes at Camp Pendleton, California were filmed on location with the full cooperation of the Marines.” Wikipedia