Welcome aboard K-Pop !
You have a great start on a fairly specific niche in the hobby. Very Cool.
I do hope that you go after the 1959 Fleer Ted Williams cards as many of them feature his career as a fighter pilot.
Also, while I am not a collector of football cards, if I was, I would collect the 1955 All-American set. It is a beautiful group of cards and includes a card that I think would fit your collection just perfectly:
Niles Kinnick was the Heisman Trophy winner for Iowa in 1939 and lost his life on a military training flight over Venezuela in 1943 at the tender age of 24. The University of Iowa's stadium is named Kinnick Stadium in his honor.
Best of luck with your pursuit,
Raymond Culpepper
NILES KINNICK.jpg