U.S. Air Force Strategic Deterrence Capabilities in the 21st Century Security EnvironmentU. S. Air Force Strategic Deterrence Capabilities in the 21st Century Security Environment Changes in the 21st century security environment require new analytic approaches to support strategic deterrence. Because current adversaries may be deterred from the use of nuclear weapons differently than were Cold War adversaries, the Air Force needs an analytic process and tools that can help determine those Air Force capabilities that will successfully