I suggest you request your dad's military records and also include a search for civilian government employment search. The NPRC in St. Louis is only currently processing emergency request for employment verification, homeless veterans, burials, and other emergency requests only. You will need to wait until they resume normal business operations.
Here is some information I found based on a genealogy search. Looks like he worked at the US Korean Consulate Office and other records indicate he was an economist.
Name: Marvin J. Winship
[Marvin Jay Winship]
Birth Date: 1 Jun 1924 Issue Year: Before 1951 Issue State: New Jersey Last Residence: 916, (U.S. Consulate) Seoul, South Korea Death Date: 1 Apr 1999
Hope this helps,
Dear Mr. Winship,
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 individual medical reports for those who served in the U.S. Armed Forces and who were separated from the service prior to 1958 are in the custody of NARA's National Personnel Records Center in St. Louis. In many cases where Army and Army Air Corps personnel records were destroyed in the 1973 fire, proof of service can be provided from other records such as morning reports, payrolls, and military orders, and a certificate of military service will be issued. Navy and Marine Corps OMPFs were not affected by the fire. Please complete a GSA Standard Form 180 and mail it to NARA's National Personnel Records Center, (Military Personnel Records), 1 Archives Drive, St. Louis, MO 63138-1002. For more information see Official Military Personnel Files (OMPF), Archival Records Requests.
For the USAID, we suggest that you request a copy of his/her Official Personnel File (OPF). OPFs and medical information 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 to National Personnel Records Center Annex, 1411 Boulder Boulevard, Valmeyer, IL 62295. Please include the full name used during Federal employment, date of birth, Social Security Number (if applicable), name and location of the 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 website at https://www.archives.gov/personnel-records-center/civilian-non-archival.
Due to the COVID-19 pandemic, the NPRC was closed from March 23 through June 23, 2020. As of June 24, the NPRC entered into Phase One of a gradual reopening process. The center 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.
NARA has closed the Civilian Personnel Records Center (CPR) in Valmeyer, IL, effective immediately and until further notice. The local jurisdiction where CPR is located (Monroe County, IL) reported public health metrics that exceeded NARA’s targets for safe operation of our facilities. CPR will remain closed until local public health conditions improve. During the closure, CPR will maintain minimal staffing levels to support emergency reference requests only.
We hope this is helpful.