Dear Ms. Terstriep,
Thank you for posting your request on History Hub!
We research the National Archives Catalog and located Records Concerning Posts, Camps, and Stations, 1945 - 1954 in Records of U.S. Army Operational, Tactical, and Support Organizations (World War II and Thereafter) (Record Group 338) which includes histories and other materials concerning Camp Ellis. The specific history you are requesting is in the folder titled “History - Camp Ellis” in Box 34. For copies of this document, please contact the National Archives at College Park - Textual Reference (RDT2) via email at firstname.lastname@example.org.
We hope this information is helpful. Best of luck with your research!