US Lockheed Martin Enters PrSM Increment 4 Race With Ramjet Missile to Hit Naval and Land Targets 1,000 km Away

Lockheed Martin is developing a ramjet-powered PrSM Increment 4 prototype for the US Army, targeting moving ships and relocatable land targets at ranges of at least 1,000 km. The design combines L3Harris propulsion with existing Precision Strike Missile guidance subsystems and retains interfaces for M142 HIMARS and M270A2 launchers. A solid rocket booster accelerates the weapon before its air-breathing ramjet sustains flight, with a booster-to-ramjet transition demonstrated in ground testing in June 2026. Lockheed is one of five competitors under prototype agreements awarded in September, with competitive flyoffs scheduled for fiscal years 2027 and 2028.