Dear Zoran Novak,
Thank you for posting your inquiry on History Hub.
Please visit NARA's Resources for Genealogists for ideas on beginning your family genealogy research. Includes information on National Archives records that may help with your research.
For more information on Vital Records, including birth and death certificates and marriage licenses. - https://www.archives.gov/research/vital-records
And for information on his military service you may wish to request a copy of his Official Military Personnel File (OMPF). OMPFs and individual medical reports for those who served in the U.S. Air Force who were separated from the service after 1946 and prior to 1959 are in the custody of NARA's National Personnel Records Center in St. Louis. For more information see Official Military Personnel Files (OMPF), Archival Records Requests
We hope you find this information helpful. Best of luck with your research.