F-5 Freedom Fighter

The Northrop F-5 Freedom Fighter is a supersonic light fighter developed as a private venture in the late 1950s and adopted in 1962 as the standard US export fighter under the Military Assistance Program. Built around two compact General Electric J85 turbojets, the first-generation F-5A single-seater, F-5B two-seater and RF-5A reconnaissance version were produced from 1962 to 1972 in the United States, Canada and Spain, about 1,200 airframes in all, and equipped air forces across the Western-aligned world. The second-generation F-5E/F Tiger II of 1972 added radar and more power and brought the family's total to some 2,600 F-5s. Most first-generation fleets were retired by the mid-2000s; as of 2026 the Freedom Fighter survives in Spain, Turkey and Botswana, with a few in Yemen, in training and display roles.

Development

NATO's 1953 NBMR-1 requirement for a lightweight tactical fighter set Northrop against the trend towards ever larger fighters: the aim was high performance and reliability at a fraction of the cost of contemporary types, with growth built in for a long service life. The enabling technology was the J85, developed for the ADM-20 Quail decoy, whose thrust-to-weight ratio far exceeded that of the F-4 Phantom II's J79; early N-156 studies carried the engines in underwing pods before they were buried in the fuselage in January 1956. The two-seat N-156T was chosen by the USAF as its T-33 replacement that July and became the T-38 Talon (1,189 built). Three N-156F fighter prototypes were ordered in February 1958 as a candidate low-cost fighter for Military Assistance Program recipients; the first flew at Edwards Air Force Base on 30 July 1959 and went supersonic on its maiden flight. Interest had almost lapsed when the requirement revived in 1961: the N-156F won the F-X competition on 23 April 1962, became the F-5A and was ordered into production that October; Norway placed the first export order in February 1964. Northrop built 624 F-5As (including the three YF-5A prototypes), 200 F-5Bs and 86 RF-5As before production ended in 1972; Canadair built 240 CF-5s and NF-5s under licence and CASA assembled 70 SF-5s in Spain.

Design

The F-5A is a small, clean low-wing aircraft with two J85 turbojets side by side in the rear fuselage, fed by intakes behind the cockpit, and a thin trapezoidal wing with wingtip rails for Sidewinders. Simple systems sized for austere operation and a design philosophy built on life-cycle cost explain its low operating cost and longevity. The first generation had no radar: the F-5A was a day fighter with a gunsight, and only later upgrades gave some fleets the Tiger II's AN/APQ-153. The F-5B gave up the nose cannon for the second cockpit but kept its combat capability; the RF-5A carried a four-camera nose. The Canadian CF-5 introduced a two-position nose gear to shorten the take-off run, later adopted on the Tiger II.

Armament

Two nose-mounted 20 mm M39A2 revolver cannon, each with 280 rounds, are complemented by seven stations for up to 7,000 lb (3,200 kg) of stores: wingtip rails for two AIM-9 Sidewinders, four underwing pylons and a centreline station for bombs, napalm, cluster munitions, rocket pods and drop tanks. Upgraded aircraft received laser-guided bombs and the AGM-65 Maverick.

F-5E/F Tiger II and later upgrades

Northrop won the 1970 International Fighter Aircraft competition with the F-5A-21, a Freedom Fighter re-engined with J85-GE-21 turbojets of 5,000 lbf (2,268 kgf) each in afterburner, lengthened for more fuel, given enlarged leading-edge extensions and, for the first time, a radar. It entered service as the F-5E Tiger II in 1973, the two-seat F-5F following in 1974; about 1,400 were built in the United States, Switzerland, South Korea and Taiwan before the line closed in 1987. The Tiger II became the aggressor aircraft of the USAF, US Navy and Marine Corps and the mainstay of several allied fighter arms, and national upgrades in Singapore, Brazil, Chile, Thailand and Morocco kept it in service into the 2020s; the F-20 Tigershark meant to succeed it found no customer. Its history is told separately; what follows concerns the first-generation fleets.

Operational History

Vietnam, 1965-1975

The F-5 entered USAF service in April 1964 with the 4441st Combat Crew Training Squadron at Williams AFB, Arizona, which trained customer-nation crews. In October 1965 the USAF sent twelve F-5As, fitted with a refuelling probe, armour and better instruments and redesignated F-5C, to Bien Hoa for the Skoshi Tiger combat evaluation; with the 10th Fighter Squadron, Commando, from April 1966 they flew some 9,900 sorties over South Vietnam and Laos for nine aircraft lost, seven to ground fire. The type was judged as capable a ground-attack aircraft as the F-100 Super Sabre, though shorter-legged, but the deployment was meant above all to support exports, and the survivors went to the Republic of Vietnam Air Force in June 1967. The RVNAF built up a force of F-5A/B, RF-5A and later F-5E aircraft, reinforced in 1972 with F-5As from Iran and Taiwan. Many were flown out to Thailand at the fall of Saigon in 1975, but North Vietnam captured 87 F-5As and 27 F-5Es, flew about 41 of them, including strikes against the Khmer Rouge, and passed examples to the Soviet Union.

Export fleets at war, 1970s-1990s

In the 1977-78 Ogaden War Ethiopia's F-5As flew interdiction and strike while its F-5Es, armed with AIM-9B, won air superiority over the Somali MiG-21s and MiG-17s, with 25 MiGs credited between 20 July and 1 September 1977 against at least three F-5s lost to ground fire. Morocco's F-5As, F-5Bs and RF-5As, in service from 1966, flew reconnaissance and strike throughout the Western Sahara War, losing 15 F-5s of all versions, several to SA-6, SA-7 and SA-9 missiles; three F-5As had attacked the royal Boeing 727 in the failed 1972 coup. Spanish SF-5As flew some 500 combat missions over the Spanish Sahara in the mid-1970s. Iran took 104 F-5As and 23 F-5Bs by 1972 but sold most on to Ethiopia, Turkey, Greece and South Vietnam as its Tiger IIs arrived, so the F-5s that fought the Iran-Iraq War were overwhelmingly F-5E/Fs. Venezuela lost three F-5s on the ground to a rebel OV-10 in the 1992 coup attempt, and four Saudi-supplied F-5Bs served North Yemen beside the F-5Es that fought the 1994 civil war.

Retirements, 1990s-2010s

The F-16 ended most European Freedom Fighter careers: the Netherlands retired its 105 NF-5s in 1991 and sold 60 to Turkey, 11 to Greece and 7 to Venezuela; Canada withdrew its CF-5s in 1995; Norway stood down its last of 108 in August 2000; Greece retired the last of some 120 F-5s in 2002. South Korea and the Philippines retired their F-5A/Bs in 2005, Venezuela's VF-5s last flew in 2010, and Turkey withdrew its F-5s from frontline service in 2013.

2020s

The survivors are second-line aircraft. Spain's 19 F-5BM two-seaters, rebuilt from 2008 with glass cockpits, still train fighter pilots at Talavera la Real; a December 2025 contract for 30 Hürjet-based SAETA II trainers, due from 2028, will replace them. Turkey keeps a dozen F-5/2000-standard NF-5A/Bs for the Turkish Stars display team, one of which crashed at Konya on 14 March 2024; the Hürjet is their planned successor too. Botswana flew 15 CF-5A/Ds as of 2024. The wider family is leaving service faster: Taiwan retired its last F-5E/Fs in 2023-25, Switzerland delivered 22 surplus F-5E/Fs to the US Marine Corps from March 2024, Brazil is drawing down its F-5EMs for the Gripen through 2029, and Israeli and US strikes destroyed Iranian F-5Es on the ground at Dezful in June 2025 and at Tabriz and Ahvaz in March 2026.

Operators

As of 2026, first-generation F-5s serve in Spain (19 F-5BM), Turkey (about 12 NF-5A/B with the Turkish Stars), and Botswana (15 CF-5A/D), with a pair of F-5Bs in Yemen. Canada, Ethiopia, Greece, Iran, the Netherlands, Norway, the Philippines, South Korea, South Vietnam, Taiwan, the United States and Venezuela are former operators; F-5E/F fleets are counted under the Tiger II.

Variants

• F-5A: single-seat day fighter without radar, 624 built; some fleets later received the AN/APQ-153.
• F-5B: two-seat combat-capable trainer without nose cannon, 200 built.
• F-5C Skoshi Tiger: twelve F-5As modified for the 1965-67 Vietnam evaluation.
• RF-5A: reconnaissance version with a four-camera nose, 86 built by Northrop.
• CF-5A/D (CF-116): Canadair-built fighter and trainer; ex-Canadian aircraft went to Venezuela (VF-5) and Botswana.
• NF-5A/B: 105 Canadair-built aircraft for the Netherlands, later sold to Turkey, Greece and Venezuela.
• SF-5A / SRF-5A / SF-5B: CASA-built Spanish versions; the surviving two-seaters are the modernised F-5BM.
• F-5E/F Tiger II: the second-generation family, described on its own.