[NeoCaveman]

You can’t sell the $1,000 back to the seller (usg) right?

The USG will redeem it for 1000 when the term is up, but will not buy it back early.

[NVDave]

That’s not entirely true - the Treasury does, in fact, call some bonds. They’ve called 30-year paper they wrote with VERY nice yields back in the early 80’s:

http://www.treasurydirect.gov/news/pressroom/pressroom_comcall011509.htm