Originally a joint US-German VSTOL fighter project, the AVS was a stepping stone on the path to future fighters.
While only a concept / wind tunnel model was built, and rough plans and grainy newspaper photos were the only documentation found, Kerbango knew that this design needed to be built.

While retaining the swing-wings of the AVS, pop-out lift engines of the bigger US-German project are complemented by adding two more Rolls-Royce/Allison XJ-99 lift engines. As well as Main-engine thrust vectoring.

VTOL takeoff flight instructions:

AG3 + VTOL slider up deploys the lift engines.
Deactivate AG3 with slider up.
Center slider.
AG4 + VTOL slider up elevates you.
Raise landing gear.
Activate AG1 and raise throttle.
Center VTOL slider.
Activate AG3.
Deactivate AG3 and AG4.
(optional: AG4 is the Gyroscope.)
Activate supersonic jets with AG2.
Wings sweep back automatically.

Easily goes from supersonic to VTOL hover.
(With 1, 2, & 4 on hit brake. VTOL slider up some.)

AG5: Activates Bombs. Use ATG to release.
AG6: Pilots eject.
AG7: Parachutes for those lucky guys.