If you're a bit dated like myself, and you have a Pilots and/or Mechanics license (to name 2)  your Social Security Number was used on your license.  With all the Identity theft that's going on, best to be safe and have it changed.  The FAA is doing this, all you have to do is send them a form letter and you'll receive a new license.  I just got my "new" license yesterday.  [:)]

Here is the .pdf file of the form:

[url]http://registry.faa.gov/docs/SSN_Change.pdf[/url]