Unless I'm very much mistaken, the metal-finish B-25 in this film clip has serial 44-29509. Plane was used in DDT spraying over polio stricken Rockford, Ill. in late August 1945.
See
https://www.criticalpast.com/video/6...radicate-polio or
https://www.youtube.com/watch?v=pJs1tlTof_s
However, at the same period this 44-29509 reportedly was in use with 17th TRS, 71st RG in the SWPA? Camouflaged and armed? At least, decal firms tell us that much....
Joe Baugher has no info on #509.
Info welcome.
Regards,
Leendert