The Department of Defense's (DOD) Future Years Defense Program (FYDP) is the official document that summarizes the force levels and funding associated with specific programs that the Secretary of Defense would like Congress to approve. The FYDP reflects decisions made in the DOD Planning, Programming, and Budgeting System, which is intended to produce the best possible mixture of forces, equipment, and support to accomplish DOD's mission. The FYDP presents estimated appropriation needs for the budget year for which funds are being requested from Congress and at least the 4 years following it. The fiscal year 2000 FYDP supported the President's 2000 budget and requested $278.5 billion for 2000 and $1,434 billion total funding for fiscal years 2001-05. The fiscal year 2001 FYDP supports the President's 2001 budget and requests $1,450 billion total funding for 2001-05. As requested, this report concentrates on the period common to both FYDPs, 2001-05, and discusses the risks that the 2001 FYDP faces that may prevent it from being implemented as planned. The report also discusses recent actions taken by Congress on DOD's budget for 2001 during its consideration of the fiscal Year 2001 National Defense Authorization Act and its enactment of the Fiscal Year 2001 Defense Appropriations Act.