The relevant signal was CADM/ BCI-55-21 ( Combt Aircraft Distinctive Markings) .
As you've no doubt found there were some discrepancies between the OFFICIAL authorisation of Oct. 16 1944 and the actual dates of application by the various Groups.
The August signal consolidated the 1BD colours and styles but the 1st CBW seem to have started on their red markings in mid-July ( note, to be applied top and bottom). Incidentally the red used was usually a bright shade rather than Insignia Red including prop hubs.
For 2BD , coloured tails orderd by BCI-55-21 from June 23 but certainly pre-empted in May by some.
For 3BD, some confusion and alterations but officially new colour markings authorised Jan. 2 1945, though 93CBW seem to have had their red from July ( B-24s) then continued on their replacement B-17s in Aug.-Sept.
Previous editions of BCI-55-21 had specified group letters, symbols etc. ( 1943).
Let me know if you agree ( or not).
post edited by buckeyeuk -