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Dear Dr. Hinson,
Thank you for posting your question to the History Hub.
Photographs that were taken by United States government employees, either military or civilian, working in an official capacity, are considered to be in the public domain. Permission is not required to use these items, but it is generally expected that you would cite the source of the photographs.
However, photographs that were taken by private citizens or by organizations other than the United States government may be subject to copyright laws. It is the user's responsibility to identify the copyright owner and to obtain all necessary clearances before making commercial, broadcast, or other use of this material. In other words, if the photographs you wish to use were not taken by a U.S. government employee working in an official capacity, then you will need to identify the individual who (or organization that) took the photographs and request permission from them to use the images.
Finally, if the images are from a National Archives’ collection, you might find this guide useful: Citing Records in the National Archives of the United States: General Information Leaflet, Number 17.
Thank you, again, for sharing your question with us, and best of luck with your ongoing work.