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Dear Mr. Streifer,
A quick search of the National Archives Catalog led us to this film: Operation Crossroads from Record Group 428: General Records of the Department of the Navy. We cannot be certain that it is the same film you found online, but the description sounds similar. Please contact the Motion Pictures & Sound Recordings Branch at the National Archives in College Park, MD with questions about this or other films in our holdings. Their email address is firstname.lastname@example.org.
Additionally, you may wish to contact Naval History & Heritage Command in case the film is currently in their custody.
Best of luck with your ongoing search, and thank you for posting your question to the History Hub.