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Dear Mr. Kirouac,
Thank you for posting your question on History Hub.
Because you are interested in a specific location rather than a squadron or unit, a good place to start your search will be with the Damage Assessment Reports in Record Group 243 - Records of the U.S. Strategic Bombing Survey, 1928 - 1947. A file for bombing assessments at Lorient, France is in Box 100 of that series and may have reports on U-boat bunker bombing missions.
Additionally, in Record Group 18 - Records of the US Army Air Forces there is a series of mission reports which shows there are several divisions, wings, and squadrons with missions to Lorient, France during World War II. Unfortunately, there is no additional information on the specific targets or dates included in the file description and each file must be searched individually to locate that information. In the "Search within this series" function on that webpage, you can type in Lorient and get results of the AAF unit and date a mission was carried out in that area (https://catalog.archives.gov/search?q=Lorient&f.ancestorNaIds=596339)
Please contact the National Archives at College Park Reference Branch for more information on the records listed above. Their email address is email@example.com. Please note that due to local COVID-19 guidelines, the staff currently may be unable to access the records to provide copies or additional information.
You may also wish to contact the Air Force Historical Research Agency, which has a larger collection of unit histories and supporting documents of Army Air Force and Air Force units. They may be able to search for specific missions in a certain area. Their physical address is 600 Chennault Circle, Maxwell AFB, AL 36112. The email address for public inquiries is AFHRA.News@us.af.mil or you can call them at 334) 953-5697 or (334) 953-2240. These files often include historical reports. Please contact that office for further information concerning these records. Please note that their website, http://www.afhra.af.mil/, states that replies to inquiries are delayed up to a few months.
We hope this information is helpful in your research.
The National Archives and Records Administration