He Flew in the same squadron as Chuck Yeager the 357'th. They flew P-51 D's as well as other models. I have a signed portrait (#381 of 400) signed by Chuck and 4 others from his squadron:
Charles E. Yeager
William 'O Bee' O'Brien
James McLane
Harvey Mace
Charles E. Weaver
I wish Bill Overstreet Jr. had signed it as well!
God Bless and God speed Bill.
Correction: They were in the same Fighter Group 357’th part of the 66th Fighter Wing of the 8th Air Force. Yeager was in the 363rd Squadron. I don't know which Squadron Overstreet was in.