Hi all first of all I am sorry if this is double post but I was unable to find the original one...

I am still looking for meaning of MSI abbreviation

I have no idea what it means but it must be some kind of unique ID of bomber and probably it is also connected with IFF?

The MSI codes are quite different for each plane of the same unit and they are aslo different for each raid.

Here are some examples from 311 SQ:

29/8/41
MSIs: LAS999, LAS111, LAS777, LAS555, LAS333, LAS224...

19/8/41
MSIs: ROD909, ROD876, ROD543,....

23/7/41
MSIs: MSC565, MSC677, MSC687, ....

15/5/41
MSIs: WJG171, WJG254, WJG212,....

I am pretty sure that is it something different than call sign and MSI is always mentioned on form SORTIE INFORMATION SHEET.

Any help much appreciated.

Pavel