Dear Mr. Murphy,
Thank you for posting your request on History Hub!
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 1959 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. If there is any information requested by the form which you do not know, you may omit it or provide estimates (such as for dates), however the more information you provide, the easier it will be to locate the correct file. For more information see Official Military Personnel Files (OMPF), Archival Records Requests.
We searched the National Archives Catalog and located Muster Rolls of U.S. Navy Ships, Stations, and Other Naval Activities, 1/1/1939 - 1/1/1949 in the Records of the Bureau of Naval Personnel (Record Group 24) that includes muster rolls for Montpelier (CL-57), 9/9/42-1/24/47. These rolls have been digitized and may be viewed online using the Catalog. According to the muster rolls, Denis James Cremins Jr. 's service number was 564 14 90 and his enlistment date was 30 October 1942. Please include this information when filling out the SF-180. Also, he enlisted in Los Angeles, California. He was first received onboard the USS Montpelier on 15 June 1943, from Naval Operating Base Noumea at Noumea, New Caledonia. At the time he was a Seaman, 2nd Class (S2c). He last showed up on the muster rolls of the Montpelier on 26 July 1946, as a Machinist Mate 2nd Class (MM2c).
We also located World War II War Diaries, Other Operational Records and Histories, ca. 1/1/1942 - ca. 6/1/1946 in the Records of the Office of the Chief of Naval Operations (Record Group 38) that contains war diaries and reports concerning the USS Montpelier’s activities during World War II. These records have been digitized and can be viewed online using the Catalog. Please note that the Catalog does not always list files in chronological order.
Next, we located Logbooks of U.S. Navy Ships and Stations, 1941 - 1983 in the Records of the Bureau of Naval Personnel (Record Group 24) that include the deck logs of the USS Montpelier (CL-57) from September 1942 through January 1947. In addition, we located World War II Action and Operational Reports in the Records of the Office of the Chief of Naval Operations (Record Group 38) that may include reports submitted by the USS Montpelier. These records are not available online. For more information, please contact the National Archives at College Park - Textual Reference (RDT2) via email at email@example.com.
Plus, we located Moving Images Relating to Military Activities, ca. 1947 - 1980 in the General Records of the Department of the Navy (Record Group 428) that includes 3 films relating to the USS Montpelier which have been digitized and may be viewed online using the Catalog. There may be other relevant films that have not been digitized yet. For more information about non-digitized films, please contact the National Archives at College Park - Motion Pictures (RDSM) via email at firstname.lastname@example.org.
Photographs of various U.S. Navy activities dating from 1940 to 2007 are in the custody of the National Archives at College Park - Still Picture (RDSS). Please contact RDSS via email at email@example.com to request a search for photographs of specific ships.
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, RDSM, and RDSS. Also, the NPRC is closed except for emergencies. Currently, NPRC will continue servicing requests ONLY associated with medical treatments, burials, and homeless veterans seeking admittance to a homeless shelter. If your request is urgent, please see Emergency Requests and Deadlines. Please refrain from submitting non-emergency requests such as replacement medals, administrative corrections, or records research until NPRC returns to pre-COVID staffing levels. Please check archives.gov/veterans for updates to the NPRC operating hours and status. We apologize for any inconvenience.
Finally, the unofficial website NavSource has a page on the USS Montpelier.
We hope this is helpful. Best of luck with your research!