The 1997 Quadrennial Defense Review (QDR) was just the latest in a series of Pentagon studies, including the 1991 Base Force Study and the 1993 Bottom-Up Review (BUR), designed to reevaluate strategy and force structure. Dissatisfied with the BUR, Congress established a Commission on Roles and Missions (CORM) with the 1994 Defense Authorization Act. The CORM recommended instituting a strategy review at four-year intervals; in response, Congress passed the Armed Forces Force Structure Act of 1996 (as part of Public Law 104-201, the National Defense Authorization Act for Fiscal Year 1997), mandating the first QDR.