Fantastic job on the V-280 Valor - that seems like one of the best ones created so far. However, on the Bell V-280 Valor family, I think you could explain the name and role of some of them - you can specify the role of the V-280M, LCV-280A, VU-280Y and so on.
First of all, the image needs re-saving and re-uploading to get rid of the horrible jpeg compression.
As for designations.
They follow standard (as best as I can tell) US naming protocols.
http://en.wikipedia.org/wiki/1962_Unite ... ion_system
~Regards.