Dear Erik White,
Thank you for posting your request on History Hub!
We suggest that you request a copy of your grandfather’s 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 before 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. 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.
For more information on Requesting Military Service Records you may want to visit - https://www.archives.gov/veterans/military-service-records
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And for information on Naval Construction Battalions, we suggest you contact the U.S. Navy Seabee Museum, 3201 N. Ventura Road, Naval Base Ventura County PH, Building 100, Port Hueneme, CA 93043. The email address is SeabeeMuseumArchive@navy.mil.
We hope this information is helpful. Best of luck with your research.
He is named in the muster roll of the 107th Naval Construction Battalion. He was assigned to Company D, Platoon Six. His rating is given as CM3C, which, in that time period, indicates he was a Carpenters Mate 3rd Class. There is a picture of him with his platoon on page 204 of the Log Book for the battalion found at this link: