Disclaimers

Controls:
AG-1: Parachute
AG-2: Weapons bay
AG-3: small guns
AG-4: Larger guns
AG-5: Countermeasures
AG-6: open nose
AG-7: open engine bays
AG-8: close canopy
Anything else?
Yes, this is purely fictional. The F-120 is a rebuild of my first variants.
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History

This starts in the '60s?!?!
The start of the F-120 goes back to the F-111.

The F-111 was one of the most successful multirole aircraft of all time. The F-111 was built as a precision bomber but saw success as a interceptor, but saw most success in the Tank Buster role. It would see more success as a tank buster than the A-10 itself. It was retired due to how expensive it was to maintain.
F-15 ish
The F-15 is next on the line.

This is the aircraft that would replace the F-111 and would see success at precision bombing aswell. The F-15 is still in service with the USAAF and won't be retired until the far future.
F-35
The F-35, oh boy. Not this plane. Seriously Elon?

The F-35 was the aircraft that replaced the F-111 in Australian service in 2009. The F-35 is very controversial, especially with Elon and Russia. The F-35 has proven itself with Israel as a very effective fighter and is being sold abroad to most of NATO.
History of this
With the F/A-XX and B-21 Raider entering service, the F-120 was made for the same role the F-111 was. Precision bombing. The F-120 was designed to be a faster B-21 with a heavy armament. It was made solely to escort B-21s and also do precision bombing.
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Now

The F-120 is a very fast bomber, although it can't have swept wings without removing some of its' stealth capabilities.

The F-120 in this configuration is equipped with four Aim-180 IR guided missiles, four Aim-304 Socker Sonar guided missiles, four Aim-300 Slacker radar guided missiles, six AGM-205 Radar guided Anti Tank missiles, and twelve GBU-204 active Lazer guided bombs.
In one configuration it could carry thirty GBU-204s or thirty AGM-205s.

In the nose, the F-120 has three systems, a sonar system, a radar system, and a IR guidance system. In testing, the Aim-304 and Aim-300 we're the most effective long range missiles and would be fitted onto a F-15.

It is powered by two TJ-6500-A jet engines. The engines were originally made to be thrust vectoring, but after the horsepower limit was reached, they found out it would be too hard to add thrust vectoring so the requirements were changed.

The final part I will mention is the guns. It comes equipped with five guns. AG-3 activates the twin M-200 Decimador cannons. AG-4 activates the two M-220 and one 40mm Bofor L/60 cannon. The combined firepower is enough to knock town the TU-4, or TUPLs B-53 Breaker.