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Here is some information please follow link and scroll and read pg.42. Hope this is helpful.
Dear Mr. Strauss,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located the series General Orders, 1919-1921 in the Records of the Army Air Forces (Record Group 18) that includes 3 references to Master Signal Electricians that might be relevant to your research. In addition, the series Orders and Memoranda, 1918-1919 in Record Group 18 includes 1 reference to Master Signal Electricians. The series Courier Cablegrams from the Adjutant General to General John J. Pershing, 1917-1919 in the Records of the American Expeditionary Forces (World War I) (Record Group 120) contains 1 reference to Master Signal Electricians. We also located 4 photographs of Master Signal Electricians that might be of interest to you. These records have all been digitized and may be viewed online using the Catalog.
Next, we located the series Bulletins Issued by the War Department, ca. 1918 - ca. 1920, General Orders, 1/20/1920-12/16/1938, General Orders, 1/6/1919-12/10/1921, and Memoranda, 4/29/1918-2/24/1921 in Record Group 18 that all include information about uniform regulations. These records have not been digitized. Please contact the National Archives at Riverside (RW-RS) at email@example.com for access to and information about these records.
We also located the series Subject Files, 1921-1947 in the Records of the Office of the Quartermaster General (Record Group 92) and the series Security Classified General Correspondence, 1921-3/1942 in the Records of the War Department General and Special Staffs (Record Group 165) that contain some information about uniforms. The series Records Relating to the History of the War Department, 1918 - 1941 (documenting 1898 - 1941) includes information about the activities of the Air Service. Plus, we located the series Gorrell's History of the American Expeditionary Forces Air Service, 1917-1919 in Record Group 120 that might contain some useful information. Please contact the National Archives at College Park - Textual Reference (RDT2) at firstname.lastname@example.org for assistance with these and similar records.
Next, we located 12 series related to the Air Service and ranks in the 1910s-1920s and 4 series related to the Air Service and uniforms in the 1910s-1920s in various record groups that may be useful for your research. Most of these records have not been digitized. Please contact the National Archives reference unit listed in each Catalog description for access to and information about those records.
Further, we suggest that you use the Catalog to explore other records created by the War Department's Air Service.
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 RW-RS, RDT2, or other NARA reference unit. We apologize for this inconvenience and appreciate your understanding and patience.
In addition to the resources Mr. Schneider provided, you may wish to review the Department of Defense publication Autonomy of the Air Arm and the US Army Center of Military History (CMH) publications Getting the Message Through: A Branch History of the Signal Corps and United States Army in the World War, 1917-1919. We suggest you contact CMH or the U.S. Army Heritage & Education Center for further assistance.
We hope this information is helpful. Best of luck with your research!