I don't think it would be a problem unless someone got overly sensitive about it. I mean, I have an Armored Cav symbol, and I haven't received my branch yet, it's just what I am hoping to become, so technically you could put me in the same category. If you wanted only those items that had been actually earned by the member to show, you would have to remove our rank as well, and in fact only about half the active members have any real quals, let alone rank, so this would be a very bare board, and all the things that you all requested would be wasted.
Take it more as a sign of respect that someone admires something/someone (say the Rangers) and wants to show that with an icon. I highly doubt anyone will take this for anymore than what it is.