The committee responsible for this report discovered early in its discussions that the terminology used to describe Cooperative Threat Reduction (CTR) program activities was varied and often confusing. Some call CTR the Nunn-Lugar Program, others associate CTR primarily with the Department of Defense, and in recent years CTR has been used generically to refer to the broad group of CTR programs spread across U.S. government departments and agencies. To facilitate its discussions, the committee established a set of terms that it uses throughout this report. In considering how best to express its vision of a future version of CTR, the committee concluded that an expression borrowed from the software industry that refers to a new version of an existing program is a useful way to describe the more advanced and comprehensive approach to cooperative threat reduction that is advocated in this report.

CTR – generic reference to cooperative threat reduction

CTR 1.0 – the original cooperative threat reduction program developed at the end of the Cold War and implemented by multiple U.S. government programs in the former Soviet Union

CTR 2.0 – a set of programs and projects to be undertaken by the U.S. government, as part of a cooperative network that includes a wide range of countries, international organizations, and nongovernment partners, to prevent, reduce, mitigate, or eliminate common threats to U.S. national security and global stability that have emerged since the end of the Cold War