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SEPECAT

SEPECAT (Société Européenne de Production de l'Avion d'École de Combat et d'Appui Tactique) was an Anglo-French joint venture aircraft manufacturer established in May 1966 to develop, produce, and commercialize the Jaguar, a twin-engine supersonic jet designed primarily as an advanced trainer and tactical ground-attack aircraft.^[1]^[2] Formed as a collaborative effort between France's Breguet Aviation and the United Kingdom's British Aircraft Corporation (BAC), SEPECAT aimed to meet the Royal Air Force's AST 362 specification for a supersonic trainer and the French Armée de l'Air's ECAT requirement for a light combat and support aircraft, evolving from earlier Breguet Br.121 and BAC designs.^[1]^[3] The partnership divided responsibilities, with Breguet handling the nose, center fuselage, and undercarriage, while BAC managed the wings, tail, intakes, and rear fuselage, powered by the jointly developed Rolls-Royce/Turbomeca Adour turbofan engines.^[1]^[4] The Jaguar prototype first flew on September 8, 1968, in France, followed by the first British prototype on 12 October 1969, leading to production models entering service with the French Air Force in 1973 and the RAF in 1974.^[2]^[5] SEPECAT oversaw the manufacture of 504 Jaguar and Jaguar International variants through 1985, including trainers, single-seat strike aircraft, and two-seat reconnaissance models, with a total global production reaching 543 units when including licensed builds by Hindustan Aeronautics Limited (HAL) in India.^[6]^[4] The Jaguar served as a versatile Cold War-era platform for close air support, deep penetration strikes, nuclear deterrence, and reconnaissance, equipping a total of eight RAF squadrons, five of which were based in Germany, and seeing combat in operations like the Gulf War and Operation Épervier in Chad.^[5]^[7] Exported to India (where it was known as "Shamsher"), Oman, Nigeria, and Ecuador, the aircraft remains in service with the Indian Air Force as of 2025, with retirement planned to begin in 2027–2028, underscoring SEPECAT's enduring legacy in multinational aerospace cooperation. SEPECAT was dissolved in 2001.^[8]^[9]

Background and Formation

Origins of the Jaguar Program

In the early 1960s, the aftermath of the 1956 Suez Crisis accelerated efforts toward European defense cooperation between Britain and France, as both nations sought to diminish reliance on U.S. military support and consolidate their declining imperial capabilities through joint projects.^[10] This geopolitical shift prompted parallel national requirements for a cost-effective, dual-role aircraft to modernize aging training and light strike fleets, setting the foundation for collaborative development.^[10] The Royal Air Force issued Air Staff Target 362 in 1963, specifying an advanced supersonic jet trainer with secondary close air support capability to replace the Folland Gnat T.1 and Hawker Hunter T.7 by the mid-1970s.^[11] The requirement emphasized a twin-engine design capable of Mach 1.7 speeds, low-altitude operations, and a modest weapons load, prompting British manufacturers including the British Aircraft Corporation (BAC) to propose concepts like the P.45, which featured Rolls-Royce RB.172 engines and evolved toward enhanced strike roles.^[11] Other submissions, such as Hunting's H.155 and Folland's Fo.147, contributed to early design explorations but highlighted the need for international partnership to manage costs.^[11] Similarly, the French Armée de l'Air defined the École de Combat et d'Appui Tactique (ECAT) requirement in 1964 for a simple, subsonic dual-role trainer and light attack aircraft to succeed obsolescent types like the Fouga Magister, Lockheed T-33, and Republic F-84F by 1970.^[11] Breguet Aviation responded with the Br.121 proposal in June 1964, a lightweight design derived from the earlier Br.1001 Taon, offering a combat radius of about 250 nautical miles with a 1,300-pound payload and powered by Turbomeca Adour engines.^[11] Selected for ECAT in January 1965, the Br.121 prioritized affordability and versatility, influencing subsequent joint efforts.^[11] By April 1965, aligned requirements from both air forces led to a Memorandum of Understanding signed on May 17, 1965, between the UK and French governments, committing to collaborative development of the Jaguar trainer alongside the separate Advanced Fighter/Variable Geometry (AFVG) program.^[11] This agreement envisioned 150 RAF trainers and 150 French variants (75 trainers and 75 strike aircraft), marking a pivotal step in Anglo-French aviation integration while BAC and Breguet prepared to lead the technical work.^[10]

Establishment of SEPECAT

SEPECAT was formally established in May 1966 as the Société Européenne de Production de l'Avion d'École de Combat et d'Appui Tactique, a binational joint venture created to manage the collaborative development of an advanced jet trainer and tactical support aircraft in response to aligned military requirements from the United Kingdom and France.^[10]^[1] The formation followed a memorandum of understanding signed that month between the British Aircraft Corporation (BAC) and Breguet Aviation, which outlined the equal partnership and work-sharing arrangement for the Jaguar program.^[10] Ownership was structured on a 50/50 basis between BAC and Breguet Aviation, ensuring balanced contributions to design, production, and profits from the aircraft.^[4]^[10] This split extended to governance, with a binational board featuring equal representation from both British and French partners to oversee decision-making and resolve any disputes.^[10] Intellectual property related to the Jaguar was jointly held, promoting shared technological advancements while protecting each party's interests. Breguet's stake later transitioned to Dassault-Breguet following the 1971 merger of Breguet Aviation with Avions Marcel Dassault.^[12]^[10] Headquartered in Paris, France, SEPECAT functioned as the prime contractor with exclusive responsibility for the Jaguar's production, marketing, and export sales under the 1966 agreement.^[13] This role encompassed coordinating manufacturing across facilities in the UK and France, as well as pursuing international commercialization to maximize the program's economic viability.^[10] Initial capital was provided equally by the partners to fund startup activities, though specific figures were not publicly detailed at the time.^[10]

Jaguar Development

Design Evolution

The design of the SEPECAT Jaguar originated from the Breguet Br.121, an unflown French light strike aircraft concept that served as the baseline for the joint Anglo-French project, with Breguet responsible for the nose, center fuselage, and undercarriage, while British Aircraft Corporation (BAC) contributed the intakes, rear fuselage, wings, and tail.^[1]^[10] This integration transformed the Br.121's modest configuration into a more capable supersonic platform, emphasizing a high-mounted swept-wing layout optimized for low-level operations.^[10] Following the establishment of SEPECAT in 1966, the project advanced rapidly, culminating in a full-scale mockup completed in 1967 that allowed for collaborative review of the airframe's ergonomics and systems integration.^[3] The first prototype, E.01, achieved its maiden flight on 8 September 1968, validating the core design's stability and performance during initial tests at Istres. Post-prototype testing revealed stability issues, leading to the addition of ventral fins and a larger tail fin for improved handling.^[1] Initially conceived primarily as an advanced two-seat trainer to meet RAF specification AST 362 and French ECAT requirements, the Jaguar's role began shifting toward a dedicated strike aircraft by the late 1960s, influenced by the RAF's need for a low-level tactical bomber after the cancellation of other programs.^[1]^[10] Aerodynamic refinements in the early 1970s focused on enhancing low-altitude handling and supersonic dash capability, including the adoption of BAC's 40-degree swept high wing with leading-edge slats, double-slotted trailing-edge flaps, and a pronounced "dogtooth" extension for improved lift distribution.^[10] These changes, combined with a redesigned fuselage for better internal volume, resulted in the final configuration measuring approximately 16.8 meters in length and 8.7 meters in wingspan, providing a balance of maneuverability and payload capacity.^[10]^[1] By 1972, production prototypes incorporated these updates, leading to the single-seat Jaguar A for the Armée de l'Air and GR.1 for the RAF, which emphasized nuclear and conventional strike roles over pure training duties.^[3] This evolution reflected the diverging yet complementary needs of the RAF and Armée de l'Air, transitioning the Jaguar from a supplementary trainer into a versatile multi-role attack aircraft capable of close air support and interdiction missions at high subsonic speeds.^[1]^[10] The iterative process under SEPECAT ensured metric-based design standardization, marking it as the first RAF combat aircraft developed in metric units, and facilitated entry into service for both air forces by 1973.^[10]

Key Technical Components

The SEPECAT Jaguar's propulsion system centered on the Rolls-Royce/Turbomeca Adour afterburning turbofan engine, developed collaboratively by the British and French firms under SEPECAT's technical oversight to meet the aircraft's requirements for efficient low-level strike operations.^[8] The dual engines, one variant being the Adour Mk 102, each provided 22.75 kN (2,320 kgf) of dry thrust and up to 32.5 kN (3,315 kgf) with afterburner, enabling reliable performance in high-stress environments.^[8] Development of the Adour began in 1964 as part of the Jaguar program, with the first engine run occurring in 1966, marking a milestone in Anglo-French aerospace cooperation.^[14] The avionics suite varied by operator but emphasized integration overseen by SEPECAT to support precision navigation and targeting, particularly for RAF variants equipped with the Ferranti inertial navigation system (INS) for accurate low-altitude flight paths.^[15] French versions incorporated Thomson-CSF systems, including a head-up display (HUD) for weapon aiming and a radar for ground mapping, ensuring compatibility with the aircraft's strike role.^[16] These components, such as the NAVWASS digital navigation and attack subsystem, were designed for seamless data processing and pilot interface, with SEPECAT coordinating standardization across variants.^[17] Armament integration under SEPECAT's guidance allowed the Jaguar to carry a diverse payload across nine hardpoints—two under each wing (four total), one centerline, and four overwing mounts—supporting up to 4,500 kg of ordnance for close air support and anti-shipping missions.^[8] Key weapons included the AS.37 Martel air-to-surface missile for standoff attacks and twin 30 mm DEFA cannons (or British Aden equivalents) with 150 rounds per gun, providing robust defensive and suppressive fire capabilities.^[8] Construction emphasized durability for low-altitude penetration, utilizing an aluminum alloy airframe for the primary structure to balance weight and strength, with titanium reinforcements in high-stress areas like engine bays and landing gear mounts to withstand operational rigors.^[10] This material selection, directed by SEPECAT's engineering standards, contributed to the aircraft's compact, rugged design optimized for nap-of-the-earth flying.^[18] Performance metrics reflected SEPECAT's focus on supersonic dash and endurance, achieving a top speed of Mach 1.6 at altitude, a combat radius of 540 km on internal fuel for typical strike profiles, and a service ceiling of 14,000 m to evade threats during ingress.^[8]

Production and Operations

Manufacturing Process

The manufacturing process for the SEPECAT Jaguar involved a collaborative effort between Breguet Aviation in France and British Aircraft Corporation (BAC) in the United Kingdom, reflecting the joint venture's structure. Production began with component fabrication split according to a 50:50 workshare agreement, where Breguet handled the nose, center fuselage, and landing gear, while BAC produced the wings, engine intakes, rear fuselage, and tail assembly. Engines were developed and manufactured jointly by Rolls-Royce in the UK and Turbomeca in France, ensuring balanced industrial contributions. This division allowed for efficient parallel production while integrating key technical components such as the Adour turbofan engines during assembly.^[10]^[1] Final assembly occurred at dedicated facilities in each country: Breguet's plant in Colomiers, near Toulouse, France, for French variants, and BAC's facility at Warton, UK, for British variants. Production commenced in 1972, with the first Jaguar A rolling off the French line in May of that year, marking the start of full-scale manufacturing after prototype testing. The first deliveries followed in 1973, with the French Armée de l'Air receiving initial Jaguar E trainers and single-seat Jaguar As, while the Royal Air Force began accepting Jaguar GR.1s in 1974. Peak production rates were achieved in the mid-to-late 1970s, supporting operational squadrons in both nations.^[1]^[10] Over the course of the program, SEPECAT produced a total of 504 Jaguar aircraft, including eight prototypes, from 1972 to 1985, with the majority allocated to France and the UK. Quality control was managed through SEPECAT oversight, involving rigorous ground and flight testing at national centers to ensure airframe integrity and systems reliability before delivery. The unit cost in the late 1970s was approximately US$8 million per aircraft, reflecting the program's emphasis on cost-effective production despite collaborative complexities. The total program experienced significant cost growth, exceeding initial estimates by over 300% between 1965 and 1970 due to development challenges.^[6]^[19]^[20]

Variants and International Sales

The SEPECAT Jaguar was produced in several variants tailored to the requirements of its primary operators, the French Armée de l'Air and the Royal Air Force (RAF), with adaptations for export markets. The Jaguar A was the single-seat close air support and tactical strike version for the French Air Force, featuring a basic navigation and attack system along with twin 30 mm DEFA cannons.^[1] The Jaguar E served as the two-seat trainer variant for France, retaining the cannons and underwing hardpoints of the A model but omitting the full navigation/attack suite to emphasize training roles.^[1] For the RAF, the Jaguar S (later designated GR.1) was the single-seat strike fighter, incorporating advanced navigation/attack avionics, a laser rangefinder in the nose, and compatibility with British weaponry.^[1] The Jaguar B (T.2) was the corresponding two-seat trainer for the RAF, similar to the S but with one cannon removed and provisions for operational training.^[1] A proposed Jaguar M naval strike variant for the French Navy, featuring strengthened undercarriage and arrestor hook for carrier operations, was cancelled in 1973 due to shifting priorities toward other aircraft.^[4] Export variants were primarily based on the more capable RAF models and marketed under the Jaguar International designation, which included overwing pylons for air-to-air missiles to appeal to non-NATO customers.^[4] For India, the Jaguar IS was the single-seat strike version, while the IB was the two-seat trainer, both produced under license with enhancements like the DARIN avionics suite; an IM maritime strike subvariant was also developed for anti-shipping roles.^[4] Other export models included the Jaguar ES/EB for Ecuador, OS/OB for Oman, and SN/BN for Nigeria, which were customized with local requirements such as specific radar or weapon integrations.^[8] SEPECAT handled exclusive commercialization of the Jaguar from its formation in 1966, conducting sales demonstrations throughout the 1970s that facilitated exports to non-NATO nations despite competition from other strike aircraft.^[1] Key export contracts included a 1978 agreement with India for 160 aircraft—40 assembled by SEPECAT and British Aerospace (BAe), with 120 to be license-built by Hindustan Aeronautics Limited (HAL)—marking the program's largest foreign sale and totaling over 200 exported airframes across all customers.^[8] Oman received 24 Jaguars (10 single-seat OS and 14 two-seat OB, including follow-on orders), delivered starting in 1977 to equip two squadrons.^[8] Ecuador acquired 12 aircraft (10 ES single-seat and 2 EB two-seat) in 1977, while Nigeria purchased 18 (13 SN single-seat and 5 BN two-seat) in 1983, with deliveries starting in 1984.^[8] Licensee production was limited to HAL in India, where assembly began in 1979 at the Nasik facility, producing approximately 120 IS/IB airframes to support the Indian Air Force's requirements; no other major licensing agreements were established.^[8] In the mid-1980s, SEPECAT and BAe pursued avionics upgrade packages for export models, including improved navigation and weapon-aiming systems, though these efforts were constrained by the company's focus on core production and eventual dissolution in the early 1990s.^[1]

Challenges and Dissolution

Corporate Conflicts

The acquisition of Breguet Aviation by Dassault in December 1971 marked a pivotal shift in SEPECAT's dynamics, as Dassault prioritized its own aircraft lines, including the Mirage family and Super Étendard, over the Jaguar program. This merger inherited the Jaguar project for Dassault but introduced conflicts of interest, with the company actively promoting competing designs like the Mirage F1 for export markets, which diminished SEPECAT's sales efforts and strained the joint venture's cohesion. The change pressured resources away from Jaguar variants, exacerbating tensions as Breguet's original commitment to the program waned under Dassault's influence.^[10]^[21] Unequal contributions between the partners further fueled internal frictions, with the French side emphasizing carrier-based adaptations to meet Aéronavale needs, while the British focused on land-based strike capabilities for the RAF. This divergence, rooted in differing national requirements—France seeking a light attack aircraft with naval potential and the UK pursuing a supersonic advanced trainer—led to design compromises that caused delays throughout the 1970s. The resulting adaptations, such as reinforced structures for carrier operations, increased complexity and extended development timelines, highlighting the challenges of aligning priorities in a binational effort.^[22]^[23] Financial disputes arose primarily from cost overruns in the Adour engine development, a joint effort by Rolls-Royce and Turboméca through their subsidiary Rolls-Royce Turboméca Ltd., selected in 1966 to power the Jaguar. Shared funding was structured equally, with the UK leading engine design and France handling airframe work under Breguet, but escalating expenses—exacerbated by the program's evolution from separate national initiatives—prompted arbitration within SEPECAT to resolve allocation issues. These overruns, which exceeded the original French cost ceiling by a factor of four, underscored the financial strains of collaborative production and necessitated ongoing negotiations to maintain parity.^[22] Political influences intensified these corporate challenges, as 1970s UK defense reviews, including the 1968 White Paper, imposed budget cuts and reoriented priorities toward European commitments, raising threats of RAF withdrawal from the program amid clashes with France's export-oriented focus. France's independent defense posture, including its 1966 NATO withdrawal, contrasted with the UK's transatlantic alignments, leading to funding disputes and periodic reassessments of the Jaguar's role. These tensions reflected broader Franco-British rivalries, with differing strategic needs—such as the RAF's emphasis on nuclear-capable strike over French naval ambitions—threatening the venture's stability.^[23]^[10] A key event encapsulating these conflicts was the 1973 cancellation of the Jaguar M naval variant, driven by France's pivot toward Dassault projects post-merger. Initially prototyped with its first flight in November 1969 and trialed aboard the carrier Clemenceau, the Jaguar M faced opposition from Dassault, which lobbied against it citing higher costs and technical risks compared to the Super Étendard. The French Navy's decision to favor the latter—a cheaper, fully French derivative of the Étendard IV—redirected resources, reassigning planned M orders to Armée de l'Air single-seaters and underscoring how corporate realignments undermined SEPECAT's naval ambitions.^[10]^[21]

Closure and Legacy

SEPECAT ceased active operations in 1981 upon the completion of Jaguar production, marking the end of the consortium's primary mandate to develop and manufacture the aircraft. With no new joint projects undertaken following the Jaguar program, the company's responsibilities reverted to its parent entities, the British Aircraft Corporation (which evolved into British Aerospace and later BAE Systems) and Breguet Aviation (subsequently integrated into Dassault Aviation), effectively winding down the binational venture as production lines in the UK and France closed.^[24] SEPECAT effectively ceased operations in 1981 upon completion of Jaguar production, with responsibilities reverting to its parent companies amid ongoing corporate restructurings. This transition saw intellectual property, tooling, and remaining support obligations divided along national lines, with each parent company assuming oversight for ongoing Jaguar maintenance and upgrades in their respective spheres of influence. The absence of follow-on initiatives underscored the challenges of sustaining long-term binational entities without continuous shared goals. SEPECAT's legacy endures through the 543 Jaguars it produced, which equipped air forces across multiple nations and remained operational into the 2010s, with the Indian Air Force—its largest export customer—continuing service into the 2020s before planned retirements beginning around 2027. As of 2025, the IAF continues to operate around 120 Jaguars despite safety incidents, including three crashes that year, with upgrades ongoing to extend service until the planned phase-out beginning in 2027-2028.^[25] The two-seat trainer variants, such as the Jaguar B and E, facilitated the training of numerous pilots in advanced strike and reconnaissance tactics, enhancing operational readiness for operators like the Royal Air Force and Armée de l'Air. Economically, the program drove substantial export success, including a $1 billion order from India in 1978, contributing to bilateral aerospace revenues and bolstering industrial capabilities in both countries.^[4]^[9]^[20] As a pioneering binational effort, SEPECAT exemplified equitable worksharing and collaborative intellectual property management between the UK and France, setting a precedent for future European defense initiatives like the Eurofighter Typhoon and influencing the multinational framework of Airbus by demonstrating the viability of integrated supply chains and joint risk-sharing in high-stakes aerospace development. This model strengthened Anglo-French ties, paving the way for subsequent partnerships in missile systems and combat aircraft programs.^[26]

References

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SEPECAT Jaguar - History - Thunder & Lightnings
A joint Breguet-BAC outfit called SEPECAT (Societe Europeeene de Production de l'Avion d'Ecole de Combat et d'Appui Tactique) was formed in May 1966.
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SEPECAT Jaguar - Pima Air & Space Museum
SEPECAT was a joint venture between the French Breguet Company and the British Aircraft Corporation to produce a new supersonic jet trainer for the Royal ...
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Feb 13, 2025 · The Jaguar was developed by Anglo-French SEPECAT, named in 1965, and first flew in 1968. It was built as both a trainer and light strike ...
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Oct 3, 2023 · First flight occurred on October 12th, 1969. Deliveries of British GR.Mk 1 began in 1973 and continued on into 1978. The aircraft was formally ...
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The Jaguar tactical support and ground-attack aircraft equipped eight first-line squadrons from 1974 and was a major element in RAF Germany's Cold-War era air ...
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SEPECAT production was completed in 1985. Licensed production by Hindustan Aeronautics Ltd. (HAL) ended in 2008. Total Produced. Through 1985, SEPECAT produced.
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5 Things You Didn't Know About The SEPECAT Jaguar Attack Aircraft
Jan 18, 2024 · The SEPECAT Jaguar served as the backbone for the French Air Force and the RAF for decades due to its capability to carry a variety of missions ...
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Nov 23, 2020 · Oman retired its last four operating Sepecat Jaguars in 2014. Design of the SEPECAT Jaguar aircraft. The Jaguar is of monoplane design with ...
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SEPECAT Jaguar, Generation, Features, Payload, Speed, News
Jul 10, 2025 · The SEPECAT Jaguar, fondly called 'Shamsher' (Sword of Justice), is a twin-engine, ground-attack aircraft primarily designed for deep penetration strike ...<|control11|><|separator|>
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May 1, 2024 · The engine update was being performed even though the Jaguar was planned to be out of service by 2008, since the Adour 104 engines were proving ...<|control11|><|separator|>
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The origins of the Jaguar date back to the early 1960s in Britain and France. In 1963 the RAF issued Air Staff Target 362, for a trainer to replace the Gnat ...
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Incorporated: December 1971 upon the merger of Avions Marcel Dassault and Breguet Aviation Employees: 15,790. Sales: FFr 14.56 billion (US$ 2.252 billion)
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Sep 1, 2003 · * In May 1966, Breguet Aviation of France and British Aircraft Corporation (BAC) formed a joint production company to build the new aircraft.Missing: venture | Show results with:venture
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Mar 17, 2020 · The French prototype flew on September 8, 1968, while the first Jaguar to be built in Britain, XW560, had its maiden flight at Warton in October ...
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HAL (SEPECAT) JAGUAR INTERNATIONAL
Fuselage all-metal, mainly aluminium, built in three main units and making use of panels and, around the cockpit(s), honeycomb panels. Local use of titanium ...Missing: construction | Show results with:construction
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This monograph presents a brief overview of the pros and cons of international collaborative weapons procurement programs, con- structing a simple conceptual ...
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A Memorandum of Understanding was signed in May 1965 for the two countries to develop two aircraft, a trainer based on the ECAT, and the larger AFVG (Anglo- ...Missing: details | Show results with:details<|control11|><|separator|>
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Jun 1, 2021 · Its original design was based on a Breguet project, the Br 121, which answered the French ECAT (avion école combat et d'appui tactique, or ...
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Jul 13, 2025 · One of the best examples of defense cooperation between the UK and France is the Sepecat Jaguar, which was created as a joint venture to develop ...