Where was They Were Expendable filmed?
1945 film by John Ford, Robert Montgomery
They Were Expendable (1945) was filmed in Miami Beach, Florida Keys and Key Biscayne, 3 places 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 3 places. Each links to the sentence that says so.
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Towns & cities
Miami Beach
United States
City in Miami-Dade County, Florida, United States
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Landscapes & nature
Florida Keys
United States
Coral cay archipelago in Florida, United States of America
“The film, which received extensive support from the Navy Department, was shot in Key Biscayne, Florida, and the Florida Keys.” Wikipedia
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Towns & cities
Key Biscayne
United States
Village in Miami-Dade County, Florida, United States