Fourth man KIA in the L-4 Cub collision most certainly Cpl. Ernest C. Graf from Chicago, IL. (16146947).
He also was with 325th FA Bn. He's buried in Skokie, IL.
See little article in
http://archives.chicagotribune.com/1...artillery-fire
To find him I used the findagrave.com website under 84th Infantry Division Casualties WW 2
Regards,
Leendert