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Dear Mr. Kruszynski,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located a series titled Unit Annual Reports, 1940-1949 in the Records of the Office of the Surgeon General (Army) (Record Group 112) that includes a history of the 648th for 1944-1945. Unfortunately, the history does not include photos.
Photographs of various U.S. Army activities dating from 1940 to 2007 are in the custody of the National Archives at College Park - Still Picture (RDSS). Please contact RDSS via email at firstname.lastname@example.org. The photograph you seek may be part of this collection.
We hope this is helpful. Best of luck with your research!