For three decades, the small, sharp F-5N Tiger II has played the bad guy at the US Navy’s adversary squadrons. Painted in Russian and Chinese splinter schemes, the little 1960s-vintage fighter has been the loyal MiG stand-in for thousands of Topgun students. That era is now ending.

According to a service plan disclosed this week, the Navy is studying whether to retire its remaining F-5s and replace them with surplus F/A-18E/F Super Hornets — a much larger, much more capable jet that can actually replicate the threats US pilots will face over a Pacific battlespace.

Why the F-5 Has Run Out of Road

The F-5 was a brilliant choice in 1990. Cheap to operate. Reasonably fast. Small radar cross-section that simulated the Mach-2 fourth-generation Soviet types. Many of the F-5s in current adversary service were second-hand airframes acquired from the Swiss Air Force, with low fatigue hours and clean structure.

But the threat the F-5 was meant to simulate no longer reflects what US pilots will face. China’s J-20 Mighty Dragon is a stealth fighter with a long-range AESA radar and beyond-visual-range PL-15 missile. Russia’s Su-35 is a supermanoeuvrable Flanker descendant with extreme energy management. The little F-5, however well painted, cannot pretend to either.

And the planforms diverge in ways that change air combat training. A modern J-20 fight is decided at 30 to 60 nautical miles, with electronic warfare and data-link cooperation. The F-5 has no AESA, no modern EW pod, no Link 16. There is no fix that makes it relevant.

Why Super Hornet, Why Now

The Navy has hundreds of legacy F/A-18C/Ds and an expanding fleet of Block I Super Hornets being displaced by the newer Block IIIs. These airframes have low fatigue life remaining for primary fleet use but plenty of life for adversary work.

Super Hornets can carry the threat-emulation pods the Navy has been developing for years: AESA jammers, fifth-generation radar signatures, fake high-power EW emitters. A Super Hornet pretending to be a J-20 can do something an F-5 fundamentally cannot — close the gap and emit at threat-level power.

It is also a useful logistical play. Spare parts, maintenance pipelines, weapons-systems schools and simulators already exist at every adversary base. Transitioning from a niche fleet (Northrop F-5) to a mainstream Navy type (F/A-18E/F) is cheaper than introducing a third type would be.

The End of a Topgun Era

For thousands of Navy and Marine pilots, the F-5 was the bad guy they first met. It was small, hard to see, fast in the vertical, and flown by adversary instructors who treated their cockpit hours as a calling. Pilots will mourn it.

But adversary training, like air combat itself, is unforgiving. If the threat moves on, the training has to move with it. The F-5 will become a museum piece. The Super Hornet — the same jet the students fly home in — will become the bad guy.

Sources: The War Zone, US Navy briefing materials, Naval News.