Dear Mr. McAlpine,
Thank you for posting your request on History Hub!
We suggest that you begin by requesting a copy of his Official Personnel File (OPF). OPFs for individuals who worked for the U.S. government in a civilian capacity since 1952 are in the custody of NARA's National Personnel Records Center. Written requests may be mailed or faxed to National Personnel Records Center Annex, 1411 Boulder Boulevard, Valmeyer, IL 62295. The fax number is 618-935-3014. Please include full name used during Federal employment, date of birth, Social Security Number (if applicable), name and location of employing Federal agency, and beginning and ending dates of Federal service. Certain information in the OPF may not be available to the general public without the written consent of the individual. For more information, please check their web site at https://www.archives.gov/personnel-records-center/civilian-non-archival
We hope this information is helpful. Best of luck with your research!