U.S. Navy Delivers Final Lot 91 Harpoon Block II Missile for Allied Anti-Ship and Coastal Strike Missions.

On April 15, 2026, the Naval Air Warfare Center Aircraft Division announced that the U.S. Navy had completed delivery of the final, 300th Harpoon missile under the Lot 91 multi-year production agreement with Boeing, a tranche focused primarily on Foreign Military Sales for allied partners.

The milestone is more than an industrial handover, because it confirms that one of America’s longest-serving precision strike weapons still occupies an important place in coalition maritime warfare. At a time when naval forces face growing pressure in contested littorals and along strategic sea lanes, the Harpoon’s continued delivery underlines the enduring relevance of U.S. missile aviation and allied interoperability.

Related Topic: U.S. Navy Completes Final Harpoon Block II Missile Update Test for Littoral and Land-Strike Operations

The U.S. Navy’s delivery of the 300th Harpoon Block II missile marks the completion of a key production run while reinforcing allied maritime strike capability through continued exports and ongoing missile upgrades (Picture Source: U.S. Naval Air Warfare Center Aircraft Division)

What the final 300th missile means is not the end of the Harpoon story, but the successful completion of a production phase that reinforces the weapon’s continued export value and operational utility. According to the official Navy release, the Lot 91 missiles were produced largely to satisfy allied demand through the U.S. Foreign Military Sales system, while the Navy’s Precision Strike Weapons program office noted that since 1977 it has delivered nearly 6,000 Harpoon missiles in air-launched, surface-launched, submarine-launched, and exercise configurations to 30 FMS partners worldwide. That scale matters strategically because Harpoon is no longer just a missile in U.S. service history; it is a common strike weapon shared across multiple allied fleets and air forces, giving Washington and partner nations a familiar, interoperable anti-ship capability that can be sustained across decades.

The timing of this delivery milestone is especially important because it coincides with fresh modernization work rather than simple program closure. On February 5, 2026, Naval Air Systems Command announced that the U.S. Navy had completed the third and final planned flight test of the Harpoon Block II Update Obsolescence Update program, with the last trial conducted on January 16 off California. That final test demonstrated a Coastal Target Suppression mission against a representative land target after earlier flights had already validated guidance performance, aerodynamic behavior, and engagement against a moving maritime surface target. Seen together, the production milestone and the flight-test milestone send a clear message: the Navy is not merely delivering old stock, but sustaining and updating a proven missile family so it remains relevant in modern sea-control and littoral strike missions.

The Harpoon Block II remains relevant because it combines a mature anti-ship design with the flexibility needed for more complex coastal warfare. NAVAIR states that the Block II variant incorporates GPS-assisted inertial navigation, enabling both anti-ship and land-attack capability, a major improvement over legacy sea-only employment profiles. That guidance architecture is especially important in littoral combat, where ships, port infrastructure, coastal missile batteries, exposed aircraft, command posts, and logistics nodes may be distributed along irregular coastlines and require more precise routing than traditional open-ocean strike missions. Boeing describes Harpoon Block II as an all-weather, over-the-horizon weapon with a low-level flight profile and a 500-pound-class warhead suitable for ships, coastal defense sites, and fixed land targets, reinforcing its value as a multi-role maritime strike system rather than a single-purpose anti-ship missile.

Its aviation dimension is one of the strongest reasons the missile still matters. NAVAIR notes that the air-launched version was deployed on the Navy’s P-3C Orion in 1979 and was also adapted for USAF B-52H bombers, while the January 2026 update test featured launch from an F-15 off the California coast. That aviation heritage gives Harpoon a tactical quality that ship-based missiles alone cannot match: fast response, wider patrol coverage, flexible basing, and the ability to concentrate anti-ship firepower quickly from aircraft operating far from the fleet. For U.S. and allied forces, air-launched Harpoon allows maritime strike capacity to be spread across patrol aircraft and fighter fleets, reducing dependence on surface combatants alone and allowing commanders to threaten hostile ships or coastal targets from several directions at short notice.

The missile’s operational history explains why this remains important. Introduced in 1977, Harpoon became one of the most widely adopted Western anti-ship missiles because it answered a problem that has never disappeared: warships remain vulnerable when aircraft, surface combatants, submarines, and coastal batteries can all launch sea-skimming strike weapons across a shared battlespace. Over time, that broad launch flexibility helped turn Harpoon into a standard allied weapon rather than a niche U.S. inventory item. The Block II evolution preserved that legacy by adapting the missile to the realities of modern conflict, where coastal targets, expeditionary logistics nodes, and ships operating close to shore may all need to be engaged within the same campaign.

Harpoon Block II remains valuable because it imposes pressure on an adversary far beyond the size of an individual salvo. A sea-skimming missile arriving from aircraft, ships, submarines, or land batteries forces defenders to watch multiple axes, activate sensors earlier, and manage compressed reaction times against low-altitude threats. In practical terms, even a limited Harpoon attack can push an opponent to reposition escorts, expose defensive layouts, commit scarce interceptors, and divert attention from other incoming threats. Block II’s added land-attack function extends that pressure into littoral warfare, where a commander may need to strike not only ships at sea, but also port facilities, coastal missile sites, and support infrastructure that enable enemy naval operations.

The final 300th delivery reinforces U.S. credibility as a supplier of interoperable strike weapons to partners facing more dangerous maritime environments. The fact that the Harpoon enterprise has supported 30 FMS partners shows that the missile is embedded in a much larger allied deterrence architecture, one in which common munitions simplify training, logistics, integration, and coalition planning. At a time when deterrence increasingly depends on the ability of allied forces to secure chokepoints, deny access to hostile naval formations, and hold coastal military infrastructure at risk, Harpoon still offers a practical and exportable American answer. The last missile in this production batch therefore marks not an ending, but proof that a proven U.S. weapon continues to serve as a bridge between industrial continuity, airpower flexibility, and coalition maritime strike capacity.

Written by Teoman S. Nicanci – Defense Analyst, Army Recognition Group

Teoman S. Nicanci holds degrees in Political Science, Comparative and International Politics, and International Relations and Diplomacy from leading Belgian universities, with research focused on Russian strategic behavior, defense technology, and modern warfare. He is a defense analyst at Army Recognition, specializing in the global defense industry, military armament, and emerging defense technologies.