Kent,
No joy as to an officer serial number for Capt. LeRoy G. Dickson. you have likely already found his enlistment record:
https://aad.archives.gov/aad/record-...g=1&rid=886986
Have added photos and image updates to his findagrave page (might take that page manager a little time to catch-up with all edit suggestions). Note he retired as a Lt Col. from the USAF reserve
https://www.findagrave.com/memorial/125480461
A little better luck with John D. Bayles searching ancestry.com. He had continued USAAF/USAF service his Officer Serial Number was O-2009510, see attached WW II Comp Request, showing a chain of serial numbers.
The John David Bayles findagrave page is here:
https://www.findagrave.com/memorial/...n-david-bayles
Still working on some suggestion updates for that page manager.