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We searched the Records of the Adjutant General's Office, 1905-1981 (Record Group 407) and located histories, after action or operation reports, and general orders of the 1186th Engineer Combat Group for WWII. These records rarely list individual names except for those that received an award or medal of some kind such as your father. For access to these records, please contact the National Archives at College Park - Textual Reference via email at email@example.com.
Copies of most of the monthly rosters from 1912-43 and 1947-59 for Army units (including Army Air Corps) are in the custody of the National Archives at St. Louis, MO. Rosters for units serving in World War II from 1944-46 were destroyed in accordance with Army disposition authorities.
Morning reports for WWII Army units are also in the custody of the National Archives at St. Louis, MO. Please contact them for access to both types of records. The address is the National Archives in St. Louis, 1 Archives Drive, St. Louis, MO 63138-1002 and the email address is firstname.lastname@example.org.
If you have not already done so, we suggest that you request a copy of his Official Military Personnel File (OMPF). OMPFs and medical records of enlisted men of the U.S. Navy who were separated from the service after 1885 and prior to 1958 are located at NARA's National Personnel Records Center (NPRC), (Military Personnel Records), 1 Archives Drive, St. Louis, MO 63138-1002. To request these records, please mail a completed GSA Standard Form 180 to NPRC. Veterans and their next of kin also may use eVetRecs to request records. See eVetRecs Help for instructions. For more information see Official Military Personnel Files (OMPF), Archival Records Requests.
Due to the COVID-19 pandemic and pursuant to guidance received from the Office of Management and Budget (OMB), NARA has adjusted its normal operations to balance the need of completing its mission-critical work while also adhering to the recommended social distancing for the safety of NARA staff. As a result of this re-prioritization of activities, you may experience a delay in receiving an initial acknowledgement as well as a substantive response to your reference request from RDT2. Also, the NPRC is currently only servicing emergency requests associated with medical treatments, burials, homeless veterans, VA Home loan guarantees, and employment opportunities. If this is urgent, please see Emergency Requests and Deadlines. We apologize for any inconvenience.
In the meantime, I see quite a few listings for Jack R. Fredenberger on Ancestry.com and FamilySearch.org. Ancestry is a fee based subscription site but you can check for access at your local library as many library systems subscribe to these sites, making them free for their patrons.
We hope this is helpful. Best of luck with your family research!
Thank you so much, Carey!
Greatly appreciated, Elliot!