Hi Bill, while researching the WWII service of my dad as well as my uncles, I found that the unit listed on their separation documents was not the unit where they spent most of their service. You could try searching morning reports for the unit listed starting with the date of separation and going back, to see if your grandfather was transfered into that unit during his service. If you are able to visit there, the researchers at the St. Louis Archives are very helpful.
Also I did a quick search and found an interesting document on US military use of prisoners of war for various types of labor (http://www.dtic.mil/dtic/tr/fulltext/u2/a438000.pdf). It's rather lengthy (it starts with the Revolutionary War), but it does describe the labor supervision company during WWII, which appeared to function just as the name describes. Hope this is of help to you, joan
Hello Mr. Oetken,
You may find this helpful, please see the records listed below, you can request these records from the following email address below by giving the the following information.
Unit Histories, 1943 - 1967
1023rd Labor Supervision Company: Histories
NAID # 1206749, UD 37042
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Dear Mr. Oetken,
Thank you for posting your request on History Hub!
We searched RG 338 Unit Histories, 1943 - 1967 and located a file unit for the 1023rd Labor Supervision Company that consisted of a 12-page historical report from 13 March 1945 to 20 September 1945. The file also contained a Transfer of Personnel by unit (no individual names) dated 13 September 1945 (3 pages); Organization Order dated 10 May 1945 (2 pages); and Table of Organization & Equipment dated 9 January 1945 (6 pages). This unit constructed POW camps for captured German soldiers. For access to or copies of this file unit, please contact the National Archives at College Park - Textual Reference (RDT2) via email at email@example.com.
Please be aware that on a DD 214 the last unit in which one served is listed. He may have been in other Military Police units while he served during WWII.
We hope this information is helpful. Best of luck with your research!