I refer to the picture of a B-25 at near bottom of article in this link:
https://blog.history.in.gov/tag/world-war-ii/
B-25 bears the letters "TUIOI". Nickname or unit abbreviation?
B-25 was part of the 477th BG, a training unit at Tuskegee Army Airfield when picture was taken (March 1945).
Thanks for info.
Regards,
Leendert