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Dear Mr. Mikolaski,
Thank you for posting your request on History Hub!
The photograph that you are seeking of the Serbian flag flying at the White House on
July 18, 1918 may be found in the series American Unofficial Collection of World War I Photographs, 1917 - 1918 in the Records of War Department General and Special Staffs (Record Group 165). Only part of the series has been digitized. For access to the remaining photographs, please contact the National Archives at College Park - Still Picture (RDSS) via email at firstname.lastname@example.org
We hope this is helpful. Best of luck with your research!