Letter to CBS News
Powerline Blog, Little Green Footballs, In DC Journal, and the Kerry Spot have strongly challenged the documents you cite from Col. Jerry Killian's personal file.
The documents in question do not appear they could have been created on a 1973 typewriter. These people have built a very strong case that you have attacked the president's National Guard record based on a forgery. I expect to see some confirmation of your sources within the next 24 hours or a public retraction of your story.
Your credibility is at stake. I hope you may satisfy these challenges promptly and openly.