On October 14, 2009, the Civilian Acquisition Council and the Defense Acquisition Regulation Council issued an interim rule that limits the use of award-fee contracts, modifies how a contractor earns an award fee, and prohibits the rollover of unearned award fees. The interim rule implements § 814 of the John Warner National Defense Authorization Act (NDAA) for Fiscal Year 2007, § 867 of the Duncan Hunter NDAA for Fiscal Year 2009, and the Office of Federal Procurement Policy Guidance Memorandum dated December 4, 2007 entitled "Appropriate Use of Incentive Contracts." The interim rule significantly revises Federal Acquisition Regulation (FAR) Part 16, adds FAR Part 16.401(e), and makes other general housekeeping changes.