the fastest way is to rename the rank picture files, so that a marshals rank picture would be under a corprals name. yea, it doesn't make much sense, cuz i dont realli know how to explain it, when i'm on my own comp, i'll add in the details
goto
C:\Program Files\Z8Games\CrossFire\rez\UI\class
find ur rank in the sclass
for example: lets say ur staff sgt 1st class
then rename sclass_100.tga into sclass_10.tga
then whenever there's a staff sgt 1st class u'll c a marshal ranking instead.
Very good way of creating false pictures to fool people