From the document: "The United States faces a world in which change occurs with everincreasing speed. New challenges are constantly emerging, while longstanding threats endure. DoD must prepare for future challenges over time, while meeting extant threats at any given time. This tension between preparations for the future and the demands of the present requires the United States to balance the risks associated with each. Because resources are always finite, hard choices must be made that take into account a wider range of risks than was necessary in the past. Some of these risks are familiar, such as the possibility of a major war. Other risks - such as the possibilities of mass casualty terrorism, cyber warfare, or CBRNE warfare - are less well understood. Through the QDR, the Department has developed a new defense strategy and an associated risk management framework, and is in the process of building new performance measures, both to better manage the risks the United States faces and to meet the defense policy goals."