Dear Mr. Dichtel,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located the series Carded Records Showing Military Service of Soldiers Who Fought in Volunteer Organizations During the American Civil War in the Records of the Adjutant General's Office (Record Group 94) that includes Dichtet, George A - Age 29, Year: 1863 - First Oregon Cavalry, Con-Don. This file has been digitized and can be viewed online through the Catalog. The “t” at the end of his name appears to be an error. Several spellings are used throughout the record.
We also located Organization Index to Pension Files of Veterans Who Served Between 1861 and 1900, 1949 - 1949 in the Records of the Department of Veterans Affairs (Record Group 15) that includes an index card for him, which we are attaching to the end of our reply. This index card indicates that there should be a pension file for him. It has not been digitized yet.
The pension index card indicates that he also served in the 2nd U.S. Infantry Regiment, a Regular Army unit. We searched the Registers of Enlistments in the United States Army, 1798 - 1914 in the Record Group 94 and located a record of Geo. A. Dicthtl, born in Bavaria Germany, who enlisted in November 1866 in Philadelphia, Pennsylvania (the adjacent state to where he was discharged earlier that year from his volunteer unit), and in 1868 was appointed to a National Cemetery. Please note that his wartime volunteer commission as lieutenant did not carry over into the Regular Army, where he instead served as a company quartermaster sergeant. We are attaching crops of the record below. Because of size limitations, we are attaching the left and right side of the register as separate images. The line for him is on the bottom of each.
The Enlistment Papers, 1798 - October 31, 1912 in the Records of the Adjutant General's Office (Record Group 94) may have additional information about his Regular Army service. These records have not been digitized yet.
To order records that have not already been digitized, please fill out a NATF Form 86 for the service records and a NATF Form 85 for the pension records and mail the completed forms to the address listed on the form. Because we already provided you the record for his Civil War service, we advise specifying on the NATF Form 86 that you are seeking the record of his Regular Army service as an enlisted person from 1866 through 1868. In regards to the request for his pension records, we suggest that you attach a copy of the pension index card to the NATF Form 85 when you submit it to help staff locate the record more quickly. For more information see Requesting Copies of Older (pre-WWI) Military Service Records.
Please note that the National Archives and Records Administration (NARA) has suspended reproduction and digitization services until further notice due to COVID-19. We have also disabled the option for ordering these records online. 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.
We hope this is helpful. Best of luck with your family research!