This report provides a current summary of ballistic and cruise missile activity in selected countries and discusses implications for U.S. national security policy. The Defense Threat Reduction Agency’s Weapons of Mass Destruction Terms of Reference Handbook defines a ballistic missile as “a missile that is guided during powered flight and unguided during free flight when the trajectory that it follows is subject only to the external influences of gravity and atmospheric drag” and a cruise missile as “a long-range, low-flying guided missile that can be launched from air, sea, and land.” Ballistic and cruise missile development and  proliferation continue to pose a threat to U.S. national security interests both at home and abroad. Approximately 35 countries currently possess operational ballistic missiles of various ranges and approximately 25 countries have operational cruise missiles with a range greater than 150 km (90 miles). Some analysts consider cruise missile proliferation to be of more concern than that of ballistic missile proliferation, primarily due to their low threshold of use, availability, affordability, and accuracy. This report will be updated annually