Dear Mr. Wood,
It is possible the certificate is part of his Official Personnel Folder. You may request certified copies of Official Personnel Folders from the National Archives at St. Louis if his service ended before 1952 by writing to firstname.lastname@example.org and if his service ended after 1952 by writing to the Federal Records Center-Civilian Personnel Records in Valmeyer, IL at:
National Personnel Records Center
1411 Boulder Boulevard
Valmeyer, IL 62295
Be sure to mention that you would like a certified copy.
Cara Moore Lebonick
Thank you for your reply. Here’s the problem, he was a civilian working on a government project and was never in the service himself. I wonder if they have records of that. I will write them and ask. Thanks again for your help.