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Dear Mr. Kunzmann,
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 records pertaining to the 4189th Labor Service Corps or the 4189th Polish Labor Service Corps.
Polish citizens who served with the U.S. Army during World War II and during the occupation of Germany and who were not officially inducted into the American Army were considered civilian employees by the U.S. Government. Official Personnel Files (OPFs) and medical information for individuals who worked for the U.S. government in a civilian capacity prior to 1954 are in the custody of the National Archives at St. Louis, P.O. Box 38757, St. Louis, MO 63138. Please include full name used during Federal employment, date of birth, name and location of employing Federal agency, beginning and ending dates of Federal Service.
We hope this information is helpful. Best of luck with your family research!