That is incorrect, changing a usersname does not
mean that we have to delete an account. In fact, we don't delete accounts at all. We only merge multiple accounts of the same user.
To USCtrojan,the matter is best explained in our FAQ, so I copied that information:
Can I change my username?
Minor changes (correction of typos, deletion of numbers or symbols after the name, addition of HRH, etc) may be made at any time. There are only a couple of situations where we allow members to make major changes to their usernames. If a username is a potential security risk (such as the member's full name), it can be changed at any time. There is also a 30-day window after joining when members can change their username if they decide they don't like the name they chose during the registration process. Members who joined more than 30 days ago may also make one change of username as long as their total post count is 50 or lower. Only one change is permitted per member. Anyone wishing to request a username change should contact an administrator by private message.
So if indeed you have a pressing reason to change it, it is best to contact any of the administrators. In general we are not too eager about it, as it may cause confusion.