OH OH OH!!!
No need to change tag guys.
To fix the tag problem, go to 'My Documents' then 'Battlefield 2' then 'Profiles'
Right click the Globle CON file and go into Properties and uncheck 'Read-only'. Open in Notepad. Go to the line that reads GlobalSettings.setNamePrefix (usualy the 2nd line) Between the "", add your tag. If filled with something else, delete it and fill it in. Save and close. Then right click the file again, go to Properties and recheck 'Read-only'.
Your done. Just go login. Don't fill out the tag prefix box when signing in. No need. It will work.
Cya kids.
† Rev. Hankster