The Israel Missile Defense Organization (IMDO) of the Directorate of Defense Research and Development (DDR&D) and the U.S. Missile Defense Agency (MDA) successfully completed a series of tests of the David's Sling Weapon System. This test series, designated David's Sling Test-4 (DST-4), was the fourth series of tests of the David's Sling Weapon System and the final milestone before declaring delivery of an operational system to the Israeli Air Force in 2016.