UK F-35B Fighter Jet Successfully Tests MBDA SPEAR Cruise Missile for Long-Range Strike.

MBDA has completed the first flight of its SPEAR miniature cruise missile aboard a UK-configured F-35B fighter jet, advancing Britain’s effort to equip its stealth combat aircraft with a long-range precision strike weapon capable of penetrating heavily defended airspace. The test, conducted from Naval Air Station Patuxent River in the United States, moves the integration program closer to operational service with Royal Navy and Royal Air Force F-35Bs while significantly increasing their ability to destroy high-value targets without entering enemy air defense envelopes.

Designed to fit inside the F-35B’s internal weapons bay, SPEAR combines low observability with stand-off range and network-enabled targeting to give British forces a survivable deep-strike capability against modern integrated air defense systems. The missile’s integration reflects a broader shift toward compact precision weapons optimized for stealth aircraft, where internal carriage, long-range engagement, and reduced exposure to enemy sensors are becoming critical requirements for future air combat operations.

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British Royal Navy F-35B Lightning II stealth fighter aircraft in flight, illustrating the aircraft selected to carry the future MBDA SPEAR long-range precision strike missile capability for the United Kingdom.  (Picture source: British MoD)

The flight involved a fully integrated multinational test team composed of personnel from the F-35 Integrated Test Force, MBDA, Lockheed Martin, BAE Systems, the UK Ministry of Defense, and U.S. government representatives. Four SPEAR missiles were loaded internally into the F-35B weapons bays before the sortie was flown by a Royal Navy test pilot from the UK Air & Space Warfare Center. The event marks the first time the missile has flown aboard the fifth-generation short-takeoff and vertical-landing combat aircraft and forms part of a wider campaign toward mission systems integration and live jettison trials.

The successful carriage flight is strategically important because it validates one of the United Kingdom’s most ambitious sovereign weapons programs for the F-35 ecosystem. Unlike many existing air-launched precision weapons adapted from legacy systems, SPEAR was specifically designed to fit internally within stealth aircraft while delivering long-range precision strike capability against mobile and protected targets. The missile enables British F-35B squadrons to conduct suppression and destruction of enemy air defense missions without exposing aircraft to high-threat engagement zones.

Powered by a turbojet engine, SPEAR offers a stand-off range believed to exceed 140 kilometers, dramatically extending the reach of the F-35B in contested environments. The compact missile is small enough to carry multiple weapons internally, preserving the aircraft’s low observability while enabling massed precision attacks. This configuration is particularly significant for carrier operations aboard the Royal Navy’s Queen Elizabeth-class aircraft carriers, where stealth preservation and sortie efficiency are critical during high-intensity operations.

SPEAR incorporates a sophisticated multi-mode seeker architecture enabling engagement of moving and maneuvering targets both at sea and on land. The missile combines network-enabled targeting with autonomous guidance functions designed to maintain effectiveness under severe electronic warfare conditions. This operational flexibility addresses lessons from contemporary conflicts in Ukraine and the Middle East, where layered air defense systems, electronic countermeasures, and mobile targets have underscored the importance of resilient, long-range precision weapons.

The program’s momentum accelerated following the first successful guided firings from the Eurofighter Typhoon in late 2024. Those trials validated core flight performance, navigation systems, and precision-engagement characteristics while demonstrating the increasing maturity of the missile’s guidance and propulsion package. The F-35B integration now represents the next major phase toward frontline operational capability.

Integration onto the F-35B is especially complex because all internal carriage weapons must comply with stringent thermal, vibration, electromagnetic, and software compatibility requirements associated with stealth aircraft. The internal weapons bay environment imposes severe engineering constraints on missile dimensions, aerodynamics, and data connectivity. Successful flight testing, therefore, demonstrates not only missile maturity but also growing confidence in the integration architecture linking the weapon to the F-35 mission systems environment.

The UK Ministry of Defense views SPEAR as a central component of its future Combat Air strategy and a key sovereign strike capability independent from U.S.-controlled weapons inventories. This has broader implications for operational autonomy, particularly in coalition environments where independent targeting, mission planning, and weapons release authority may become strategically important. The missile also strengthens Britain’s position within NATO by providing allied air forces with a highly survivable deep-strike option optimized for modern integrated air defense environments.

The broader SPEAR family concept further enhances the program's operational value. MBDA is developing SPEAR-EW, an electronic warfare derivative intended to serve as a stand-in jammer, disrupting hostile radar and air defense networks ahead of strike packages. Unlike traditional escort-jamming aircraft, expendable electronic warfare effectors can penetrate defended airspace with lower risk while saturating enemy sensor networks. This creates a force multiplier effect for both stealth and conventional aircraft operating in heavily contested regions.

MBDA has also introduced SPEAR Glide, a lower-cost, potentially high-volume variant intended to complement the powered missile family. The glide weapon is designed for rapid, scalable production and may provide commanders with a more affordable precision engagement option against lower-priority or less-defended targets, while preserving higher-end turbojet-powered SPEAR missiles for critical missions.

Export interest in the missile continues to grow as international operators seek compact, precision-strike weapons compatible with next-generation combat aircraft. One of the most notable recent developments occurred at Seoul ADEX 2025, where Korean Aerospace Industries and MBDA signed a memorandum of understanding to study integrating SPEAR onto the KF-21 Boramae fighter aircraft. Such integration could significantly enhance South Korea’s indigenous strike capabilities against hardened and mobile threats across the Korean Peninsula.

The missile’s growing relevance also reflects wider shifts in global air warfare doctrine. Air forces increasingly require weapons capable of defeating dispersed, mobile, and electronically protected targets while minimizing collateral damage and reducing aircraft exposure. SPEAR directly addresses these demands through a combination of precision guidance, network-enabled targeting, survivability against countermeasures, and compatibility with compact internal carriage.

For the F-35B specifically, adding SPEAR would substantially expand mission flexibility. Current internal strike options remain comparatively limited in number and specialization. SPEAR introduces the possibility of carrying multiple precision stand-off weapons internally, allowing a single stealth fighter to prosecute multiple independent targets during a single sortie while remaining difficult to detect. This capability is especially valuable in maritime strike operations, suppression of enemy air defenses, and expeditionary carrier-based warfare.

The program also reinforces MBDA’s growing position as Europe’s leading sovereign missile manufacturer, at a time when Western nations are accelerating investment in long-range precision-strike capabilities. Demand for stand-off munitions has surged following observations from Ukraine, where consumption rates of precision weapons have exceeded many pre-war assumptions regarding industrial sustainment capacity. SPEAR’s modular architecture and scalable family approach may therefore position it as a long-term cornerstone for the development of future European precision strike capability.

Additional F-35 weapons integration developments involving the MBDA METEOR beyond-visual-range air-to-air missile are also progressing on both the F-35A and F-35B variants, further strengthening the United Kingdom and Italy’s ambition to field a highly capable sovereign weapons package on the fifth-generation fighter. Combined, METEOR and SPEAR would provide British F-35 squadrons with both long-range air-dominance and deep precision-strike capabilities optimized for modern high-threat environments.

Written by Alain Servaes – Chief Editor, Army Recognition Group
Alain Servaes is a former infantry non-commissioned officer and the founder of Army Recognition. With over 20 years in defense journalism, he provides expert analysis on military equipment, NATO operations, and the global defense industry.