Israel’s missile defenses are layered because rockets, cruise missiles and ballistic missiles present different problems. Iron Dome is designed for short-range rockets and similar threats; David’s Sling addresses heavier rockets and short-range ballistic missiles; Arrow systems intercept longer-range ballistic missiles. Their engagement capabilities depend on the threat and circumstances, so a single range or interception rate does not describe a system universally.
Three systems, different targets
Iron Dome uses radar and battle-management software to identify incoming projectiles and launch an interceptor when the predicted impact area warrants engagement. It is designed to defend populated areas and key sites from short-range rockets. The system’s development involved Israel’s defense establishment and U.S. support, and production includes U.S. co-production.
David’s Sling fills a middle layer. The U.S. Missile Defense Agency describes it as a system designed to counter threats including rockets, missiles and aircraft. Arrow is designed to intercept ballistic missiles at longer ranges, including threats outside the atmosphere in the case of Arrow 3. These systems are not interchangeable, and system performance depends on the specific projectile, trajectory, sensor picture and engagement conditions.
How the United States participates
U.S. support comes through development funding, testing, procurement and industrial cooperation. The Missile Defense Agency’s international cooperation program lists Israel’s cooperation on the deployed Arrow system and its improvement program, development of David’s Sling, and Iron Dome co-production. The relationship is reciprocal: U.S. participation in testing and development contributes knowledge and capabilities relevant to U.S. missile defense as well.
The 2019 U.S.-Israel assistance MOU planned $500 million per year for cooperative missile, rocket and projectile defense programs during fiscal years 2019–2028. The signed document explicitly says this funding is not tied to a predetermined quantity of Iron Dome, David’s Sling or Arrow equipment. Annual congressional appropriations and separate bilateral program agreements govern implementation. The MOU text also calls for co-production of system components in the United States.
Layering, not a single protective shield
Israel combines these interceptors with warning systems, sensors and passive defenses. No interceptor can eliminate every threat, and each engagement involves decisions about whether, when and where to fire. Iron Beam, Israel’s laser-based system, is a separate technology effort and should not be described as an unlimited or cost-free replacement for interceptors.
For details on the funding framework, read U.S. aid and QME. The history page also explains how defense cooperation became one part of a broader bilateral relationship.