Please Note: The US State Department under John Kerry, who served in Viet Nam, is now charging $2350 to receive any CLN whether one has relinquished or renounced. So if you are coming to this only now, you are SOL when it comes to getting a free CLN.
See also Relinquishing your US citizenship in Germany
Those of us who have participated in the Expat Forum have seen that one of the first things that many many newbies say is, “I am going to renounce my US citizenship as soon as I have my Canadian citizenship.” Now, I want to suggest that one should never renounce their citizenship if they can relinquish it instead. Months ago I wrote a post on this subject, which I provide below.