Letter C not used in the 354 FG?
 

Was going through the new 354th FG book and notice that there was no aircraft that had the individual letter "C" in all three squadrons so I got my Claim book by Mr. Olynyk.Checked through that with no letter "C" aircraft in there either.
I was wondering if anybody knew why this was the case.
If it is in the book I missed it because I have not read it cover to cover.Sorry I look at the photo's, a/c list first.
I know this is an odd question but I think it is interesting .
Thank you for your time.
Rick