For those who have the game you know that you cant have symbols in your clan tag. BUT! My awesome friend WMD found a way that may or may not be known as of now.
Simply, Go to C:\Program Files\Steam\Steamapps\Common\CODBO\Players\ or C:\Program Files (x86)\Steam\Steamapps\Common\CODBO\Players\ for 64-bit, and open your config_mp with note pad.
Search with CTRL + F and search for clan.
Then you see your current clan tag in there.
Just type any 4-letter, number, or symbol combo and save and open cod
YOURE DONE!
You can also do this to put colors in your custom class names!
Hope this helped, because as of now i believe it to be relatively unknown, just hit the thanks button if it did though!