You can find the citation in his military records, most of these DFC citations that were issued did not have a descriptive citation like a Silver Star or Bronze Star Medal. Most of the DFC citations mention date of the distinguished act such as particular mission. If you provide additional information on the individual they have AF Award cards that are available online for research.
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Many of the historical and operational records of the Distinguished Flying Cross Award have been microfilmed by the Air Force Historical Research Agency (AFHRA). The National Archives at College Park - Textual Reference (RDT2) has a copy of the microfilm. For access to the microfilm, please use the index to the Air Force History microfilm available at http://www.airforcehistoryindex.org/ For more information, please contact the National Archives at College Park - Textual Reference (RDT2) at firstname.lastname@example.org.
Also, unit histories and supporting documents of Army Air Force and Air Force units are in the custody of the Air Force Historical Research Agency, 600 Chennault Circle, Building 1405, Maxwell Air Force Base, AL 36112-6424. These files often include historical reports. Please call (334) 953-5697 or write to that office for further information concerning these records. The web site is https://www.afhra.af.mil/.
Due to the COVID-19 pandemic and pursuant to guidance received from the Office of Management and Budget (OMB), NARA has adjusted its normal operations to balance the need of completing its mission-critical work while also adhering to the recommended social distancing for the safety of NARA staff. As a result of this re-prioritization of activities, you may experience a delay in receiving an initial acknowledgement as well as a substantive response to your reference request from National Archives at College Park - Textual Reference (RDT2). We apologize for this inconvenience and appreciate your understanding and patience.
We hope this is helpful. Best of luck with your family research!