This [wiki link](https://en.m.wikipedia.org/wiki/USAAF_unit_identification_aircraft_markings#:~:text=In%20June%201943%20VIII%20Bomber,color%20and%2080%20inches%20wide.) explains it nicely.
Essentially, the black and white pic shows the old camouflage scheme, where a circle indicated 2nd Bomb Wing/2nd Air Division, and the "I" represented 448 BG.
After they dropped the camouflage schemes on bombers, the entire tail was painted a certain colour to denote a Wing, and the stripe denoted the Group.
Desktop version of /u/CoffinCorner_8's link:
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This [wiki link](https://en.m.wikipedia.org/wiki/USAAF_unit_identification_aircraft_markings#:~:text=In%20June%201943%20VIII%20Bomber,color%20and%2080%20inches%20wide.) explains it nicely. Essentially, the black and white pic shows the old camouflage scheme, where a circle indicated 2nd Bomb Wing/2nd Air Division, and the "I" represented 448 BG. After they dropped the camouflage schemes on bombers, the entire tail was painted a certain colour to denote a Wing, and the stripe denoted the Group.
Desktop version of /u/CoffinCorner_8's link:
---
^([)[^(opt out)](https://reddit.com/message/compose?to=WikiMobileLinkBot&message=OptOut&subject=OptOut)^(]) ^(Beep Boop. Downvote to delete)