American Allies Loved This American Supersonic Lightweight Fighter More Than the US Air Force Did

In the realm of fighter jets, the primary focus has consistently been on enhancing speed and affordability in acquisition and upkeep, without compromising their effectiveness in combat missions. Northrop Corporation was confident that it had developed an aircraft that met these criteria: the F-5. Regrettably, although it has been used by many U.S. allies and is still in service, it did not garner a lot of interest from the US Air Force.

Developing a lighter, faster and smaller supersonic fighter

The origin story for the Northrop F-5 dates all the way back to the 1950s, when Edgar Schmued, an aircraft designer and the vice president of engineering at the Northrop Corporation, told his team to begin designing an aircraft that went against convention. By that, he meant that, instead of developing a large and heavy fighter jet like other companies, Northrop should focus on putting together one that was lightweight, reliable and highly maneuverable - oh, and it also needed to be cheap to maintain.

This was a tough order, but Schmued's team was more than up to the challenge. They were helped along the way by Walko Gasich, Northrop's chief engineer. He suggested the engines be placed within the fuselage, to maximize performance, and defined what is now known as the "life cycle cost" for aircraft, giving the designers a framework within which to work and strive.

More interested in a trainer than a combat aircraft

Northrop Corporation initially anticipated US Air Force interest in the F-5, originally known as the N-156F. However, the military's enthusiasm was not aligned with the company's expectations; rather than seeking a combat role, they were more interested in a trainer variant: the two-seater YT-38 Talon.

Despite the preference for the YT-38, Northrop continued on with the N-156F project independently. In February 1958, an order for three prototypes was placed under the Military Assistance Program, allowing for potential exports to US allied nations. Although initially met with tepid interest, the momentum shifted during President John F. Kennedy 's administration, culminating in the Royal Norwegian Air Force receiving the first operational F-5s in 1964.

Northrop F-5A/B Freedom Fighter vs. F-5E/F Tiger II

The first iterations of the Northrop F-5 were the "A" and "B" Freedom Fighter models. As aforementioned, they entered service in the 1960s, during the height of the Cold War , with more than 800 being manufactured and delivered to international partners.

Following the International Fighter Aircraft Competition, the Northrop Corporation introduced a more advanced version of the F-5. The "E" and "F" variants - the Tiger II - featured several upgrades , including a better fuel capacity, advanced avionics, a greater wing area with improved leading edge extensions, an inertial navigation system and the air-to-air refueling capabilities.

Similarly to the previous versions of the fighter, the F-5E/F was (and continues to be) operated by American allies. While some units are flown by branches of the US military, this is in more of a training capacity. By the time production ceased in 1987, the total number of aircraft produced under these two variants was around 1,400.

Northrop F-5E/F Tiger II specs.

As aforementioned, the Northrop F-5E/F Tiger II is the more advanced version of this lightweight fighter - but how is it different from its "A" and "B" predecessors? Well, for starters, it features a much more powerful pair of engines, replacing the original J85 power plants with more capable J-85-GE-21s. These allow the F-5E/F to reach a maximum speed of Mach 1.63, with a 140-mile range when carrying weaponry on its hard points.

Speaking of weaponry, the F-5E/F makes use of a combination of aircraft-mounted cannons and droppable munitions that allow it to hit targets both in the air and on the ground. It's primary armaments are two 20 mm M39A2 Revolvers at the nose, while its seven hard points (one under the fuselage, four at the wing-tips and four under the wings) allow for the equipping of a variety of missiles and rocket pods and/or the storing of drop fuel tanks and air-to-ground ordnance.

Operational service over the decades

Despite being designed in the 1950s, the Northrop F-5 continues to see active service around the world, with the likes of Brazil, Mexico, Thailand, Honduras, Iran and others still equipping it.

In regards to the US Air Force, the fighter first entered service as a trainer with the 4441st Combat Crew Training Squadron at the former Williams Air Force Base, Arizona. The following year, the F-5 underwent a combat exercise in Vietnam with the 4503rd Tactical Fighter Squadron and South Vietnamese forces. Dubbed Skoshi Tiger , it saw 12 modified aircraft, redesignated the F-5C, fly more than 2,500 combat sorties in the skies over Vietnam.

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Nine of the fighters were lost during the five-to-six-month period the test ran. While overall deemed a success, the Air Force still failed to show enough interest to utilize the F-5 outside of its training capacity.