USERRA is the latest in a series of laws protecting veterans' employment and reemployment rights going back to the Selective Training and Service Act of 1940. USERRA's immediate predecessor was commonly referred to as the Veterans' Reemployment Rights Act (VRRA), which was enacted as section 404 of the Vietnam Era Veterans' Readjustment Assistance Act of 1974. In enacting USERRA, Congress emphasized USERRA's continuity with the VRRA and its intention to clarify and strengthen that law. Congress also emphasized that Federal laws protecting veterans' employment and reemployment rights for the past fifty years had been successful and that the large body of case law that had developed under those statutes remained in full force and effect, to the extent it is consistent with USERRA. USERRA authorized the Department of Labor to publish regulations implementing the Act for State, local government, and private employers. USERRA also authorized the Office of Personnel Management to issue regulations implementing the Act for Federal executive agencies (other than some Federal intelligence agencies). USERRA established a separate program for employees of some Federal intelligence agencies.