As next of kin, you would have to contact the National Archives and Records Administration to get more information. Day, month and year of birth to start, and if you know it, where they were assigned.
https://www.loc.gov/vets/bib-factsheet.html
The name of their Battalion or Division would also be good to know since there are various online sites that post some information on them. For example, 366th
Engineer Aviation Battalion.
Construction and rebuilding and a lot of behind the lines, non-combat work involved a lot of service personnel.
Ed