Air Force Reusable Booster Program Cancelled

Prototype Reusable Rocket Effort Felled by U.S. Budget Woes
Space News, 19 October 2012
http://www.spacenews.com/launch/121019-prototype-reusable-rocket-felled.html

Due to “unexpected funding reductions,” the U.S. Air Force is discontinuing work on a prototype reusable rocket design effort that the U.S. National Research Council recently cited as a key steppingstone to an operational system.