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Dear Ms. Armstrong,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located the series Classified Central Decimal Files, 1940-1948 in the Records of the Office of the Chief Signal Officer (Record Group 111) that includes records related to the White House Signal Detachment and that may contain a copy of the order you are seeking. We also located the series Security Classified Reports Relating to the Organization of the War Department, 1938-1946 in the Records of the War Department General and Special Staffs (Record Group 165) that includes some orders and records related to the Signal Corps. These records have not been digitized. Please contact the National Archives at College Park - Textual Reference (RDT2) at firstname.lastname@example.org for access to and information about these and similar records.
Next, we located the series Subject Files, 1942-1946 in the Dewitt Greer Papers (Collection HST-DGP). Dewitt Greer served as the commanding officer of the White House Signal Detachment from 1943-1946, and there may be some relevant information in this series. These records have not been digitized. Please contact the Harry S. Truman Library (LP-HST) at email@example.com for assistance with these records.
You can also find a brief history of the White House Communications Agency, formerly the White House Army Signal Agency and White House Signal Detachment in the Catalog, along with links to series created by various iterations of the organization.
Due to the COVID-19 pandemic and pursuant to guidance received from the Office of Management and Budget (OMB), NARA has adjusted its normal operations to balance the need of completing its mission-critical work while also adhering to the recommended social distancing for the safety of NARA staff. As a result of this re-prioritization of activities, you may experience a delay in receiving an initial acknowledgement as well as a substantive response to your reference request from RDT2 and LP-HST. We apologize for this inconvenience and appreciate your understanding and patience.
Finally, we suggest that you contact the White House Communications Agency directly for further assistance.
We hope this is helpful. Best of luck with your research!