ESSM Block 2 reaches its 1,000th delivery for the NATO consortium

The U.S. Navy’s NATO SEASPARROW Program has delivered its 1,000th Evolved SeaSparrow Missile Block 2, marking a new production milestone for the system.¹ The Navy’s NATO SEASPARROW Program Office, known as PMX-312, announced the milestone on November 2.² The delivered missile was made for the NATO SEASPARROW Consortium, which brings together 12 participating nations.¹² The program had reached delivery of its 500th missile in June 2025, so the new mark is twice that earlier delivery total.¹ The account of the milestones says deliveries doubled between the 500th-missile point in 2025 and the 1,000th-missile point announced in 2026.²

The ceremony and the announcement were separate events: the NATO SeaSparrow team celebrated the delivery in Camden, Arkansas, on October 28.¹² The Navy program office later made the milestone public on November 2, according to the report of the announcement.² The 1,000 figure counts missiles delivered, while the available information does not give a matching number for missiles deployed or held by each partner.¹² Raytheon, which operates as an RTX business, is the prime contractor responsible for ESSM Block 2 production.¹ The record therefore describes an output milestone involving the program, its contractor and the consortium, rather than a disclosed inventory breakdown.¹²

ESSM Block 2 is launched from ships and is intended to protect a vessel itself as well as an area around it.¹ The system is designed to intercept aircraft, anti-ship cruise missiles and other threats in the air.² Those roles make the delivery milestone relevant to naval defenses, but the count alone does not establish where the missiles have been assigned.¹² The 1,000th missile was produced for the consortium as a whole, rather than identified in the available account as a national allocation.² The Navy has not released either the distribution among participating countries or the number that has entered operational service.²

Block 2 differs from earlier versions through an upgraded guidance arrangement that combines active and semi-active radar seeking.² Earlier ESSM versions rely on the launching ship to illuminate a target with radar as the missile approaches the end of its flight.² With Block 2, an active seeker can find and follow targets independently during the final phase of an engagement.² That capability lessens the need for the ship to keep radar focused on a target throughout that phase.² The source says this also gives a ship’s combat system greater flexibility when addressing more than one threat.²

A U.S. Navy Mk 41 Vertical Launching System can carry ESSM in groups of four within one launcher cell, when a warship is compatible.² That arrangement allows a compatible ship to place four of these missiles in a cell, rather than treating each cell as holding only one ESSM.² The detail describes a possible way to use the launcher, not the number of ESSMs carried by any particular ship.² It also does not say how many of the 1,000 delivered missiles are currently at sea or assigned to individual fleets.¹² The announced delivery total and the shipboard capacity detail therefore measure different things: program output and a loading option, respectively.¹²

The production milestone comes amid operations in which U.S. and allied warships have defended commercial shipping and naval vessels from Houthi attacks.² Those operations have taken place in the Red Sea and the Gulf of Aden, according to the account of the maritime-defense activity.² A January 2025 report by The War Zone relayed Vice Adm. Brendan McLane’s statement that the Navy fired nearly 400 munitions over about 15 months of Red Sea operations.² The reported breakdown listed 120 SM-2 missiles and 80 SM-6 missiles, plus 20 interceptors counted together as ESSM and SM-3.² The 20 figure combines two interceptor types and does not provide separate totals for ESSM and SM-3.²

The operational figures cannot be read as a count of Block 2 use, because they do not separate ESSM Block 1 from ESSM Block 2.² They also cover reported munitions fired during Red Sea operations, whereas the 1,000 milestone counts Block 2 deliveries under the program.¹² These measures describe different stages and categories, so the reported firing totals do not establish how many delivered Block 2 missiles were used.¹² Warships have limited missile magazines, and reloading vertical launch systems while at sea is more difficult than replenishing ordinary ammunition.² That constraint is relevant context for shipboard missile use, but the available figures do not quantify any effect on ESSM Block 2 stocks.²

The NATO SEASPARROW Project began in 1968 and is described as one of NATO’s longest-running cooperative weapons efforts.¹ Its consortium consists of Australia, Belgium, Canada, Denmark, Germany, Greece, the Netherlands, Norway, Portugal, Spain, Türkiye and the United States.¹ Capt. John Bowman said the delivery mattered to the consortium, PMX-312, industry partners and the Sailors who depend on the missiles.¹ Bowman also presented the milestone as evidence of the contribution of international cooperation and a resilient industrial base to meeting member nations’ maritime-defense needs at scale.¹ His comments frame the delivery as a joint program achievement, while the public information still leaves national allocations and operational totals undisclosed.¹²

The central change is the rise from the program’s 500th delivery in June 2025 to its 1,000th delivered Block 2 missile.¹ The reported doubling connects those two delivery milestones, but does not by itself reveal how quickly individual partner nations received missiles.¹² Nor does the total disclose how many deliveries became operational weapons, a distinction the Navy has not resolved in the reported information.¹² The available material establishes a manufacturing and delivery achievement for a long-running multinational program, alongside a missile designed for ship and local-area defense.¹ Supported: the sources document the delivery milestone but do not show operational numbers or country-by-country allocations.¹