Dear Ms. Waddell,
Thank you for posting your request on History Hub!
We searched the World War II Operations Reports, 1940-1948 in the Records of the Adjutant General's Office, 1905-1981 (Record Group 407) and the Unit Histories, 1943 - 1967 in the Records of U.S. Army Operational, Tactical, and Support Organizations (World War II and Thereafter), 1917-1999 (Record Group 338) but were unable to locate any records of the 1097th Service Command Unit during or after WWII.
For access to personnel records of non-active duty National Guard enlisted personnel and officers in the Army, please contact the Adjutant General of the Washington State National Guard Association via email at firstname.lastname@example.org or the web site at www.ngaw.org.
We hope this information is helpful. Best of luck with your family research!