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You can request military records by going to https://www.archives.gov/veterans
found his obituary while searching
Col. Scott is listed on fold3.com...it is a pay site...you can get 7 days free after free trial it is $7.95 a month. I do not have a subscription so I am just giving you a preview of what is there for Col. Scott.
Dear Mr. Horton,
Thank you for posting your request on History Hub!
Based on the date that he retired, there will NOT be an Official Military Personnel File for him at the National Personnel Records Center (NPRC). Please do not submit an SF-180 to NPRC.
We searched the National Archives Catalog and located Letters Received, 1863 - 1917 in the Records of the Adjutant General's Office (Record Group 94) that consists of letters, reports, and papers relating to the military service of officers of the Regular Army. While portions of this series have been digitized and are available online, the records for the time period in which Walter S. Scott served are not online yet. To order copies of these records, please fill out a NATF Form 86 and mail the completed form to the address listed on the form. Be sure to mark that he was Regular Army, an Officer, and that he was in the Infantry. For more information see Requesting Copies of Older (pre-WWI) Military Service Records. There is a reproduction fee for this service.
In regards to unit records, we searched the National Archives Catalog and located records for the 25th Infantry Regiment in the Records of U.S. Regular Army Mobile Units (Record Group 391). Based on the information provided in the register shared by Mr. Schneider, we also located records for the 4th Infantry Regiment, the 18th Infantry Regiment, the 11th Infantry Regiment, and the 15th Infantry Regiment mostly in Record Group 391. For more information about these records, please email the National Archives at Washington, DC - Textual Reference (RDT1) at Archives1reference@nara.gov.
The full pension file for him that corresponds to the index cards that Mr. Schneider shared with you could be at either RDT1 and/or the National Archives in St. Louis (RL-SL). To request a search for the file, please email both RDT1 at Archives1reference@nara.gov and RL-SL at email@example.com. We suggest that you attach copies of the Veterans Administration index cards to your emails and/or link this History Hub discussion with an explanation of which comments have the cards.
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 RDT1 and RL-SL. Also, the National Archives and Records Administration (NARA) has suspended non-emergency reproduction and digitization services until further notice due to COVID-19. Orders will not be serviced until operations can resume safely. Once operations resume, document reproduction requests will be filled in the order in which they were received. We apologize for any inconvenience.
Official Army Registers such as the one shared by Mr. Schneider are available through Fold3 as Army Registers, 1798-1969. A search for Walter S. Scott turns up a number of results. Viewing these publications through Fold3 requires a paid subscription. Some libraries provide free access to Fold3 for their patrons. Also, some editions of the Official Army Register are available on HathiTrust and the Internet Archive for free.
We hope this is helpful. Best of luck with your research!