US Navy leads 12-nation NATO effort to develop next-gen SeaSparrow missile

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The U.S. Navy is leading a multinational effort to develop a new version of the Evolved SeaSparrow air defense missile.

The goal is to create a variant of the SeaSparrow that can be used by the 12 nations in the NATO SeaSparrow Project Office consortium, or NSPO, according to the Navy Sources Sought notice. The deadline is Oct. 19.

The NSPO is looking for a weapon that can be employed against a wide variety of threats. The NSV SeaSparrow “should have capability against current and future threat classes spanning a variety of threat characteristics including velocity (low-speed to high-speed), altitude (sea skimming to high diver), maneuverability (non-maneuvering to high Gravitational (G)-Force maneuvers), and signatures,” the Navy said.

The NSV is also meant to defend the fleet against massed salvos of missiles and function despite jamming.

The weapon “should be able to work in complex natural, contested, Radio Frequency (RF), Electro-Optical (EO), and/or Infrared (IR) environments.”

“The missile should have the capability to discriminate and resolve between multiple closely spaced targets and provide threat-track measurements to support missile guidance, navigation and lethality functions,” the Sources Sought notice continues. “The missile should have the capability to handle threat countermeasures.”

The notice included a graphic that appeared to depict surface ships — including two aircraft carriers — being targeted by a dozen missiles and torpedoes, plus a hostile fixed-wing aircraft and a helicopter. The friendly ships appeared to be using active illumination to paint some threats, while the SeaSparrow used its on-board sensors to intercept others.

NSPO seeks a modular, open-source design that would give the U.S. government “maximum rights in technical data, computer software, and computer software documentation (including source code), design artifacts, and interface specifications.”

“This approach will simplify future upgrades, promote interoperability across consortium platforms, and outpace evolving threats,” the notice said.

The NSPO wants contractors who can provide a complete missile system, including airframe, propulsion, guidance and software. The missile should have no more than a 10-inch diameter and fit inside a Mark 41 vertical launch tube.

The Sources Sought notice emphasized that the missile and its technical data should be releasable to the entire NATO SEASPARROW Consortium: Australia, Belgium, Canada, Denmark, Germany, Greece, the Netherlands, Norway, Portugal, Spain, Turkey and the U.S. Other users include Thailand and the United Arab Emirates.

The Block II RIM-162 Evolved SeaSparrow is currently manufactured by Raytheon, which doubled production to more than 350 missiles in 2025. Amid naval operations in the Persian Gulf, where Iran has launched numerous missiles and drones against dwindling stocks of U.S. and allied interceptors, future demand for short-range air defense weapons is likely to be brisk.

First fielded in 2004, the Evolved SeaSparrow is descended from the 1950s AIM-7 Sparrow radar-guided air-to-air missile.

Though the original Sparrow had a mixed combat record as an aerial combat weapon in the Vietnam War, the Evolved SeaSparrow was intended as a low-cost defense against anti-ship missiles, aircraft, helicopters and fast attack boats. The current version has an estimated range of around 30 miles.