An add-on for ACE COMBAT™7: SKIES UNKNOWN.
This set contains the following:

Playable Aircraft: F-15 S/MTD
This new-and-improved experimental F-15 is equipped with 2D thrust vectoring nozzles and large canards for increased air combat maneuverability. This aircraft takes even greater command over the battlefield than its predecessor, overwhelming both air and ground targets with its sheer offensive power.
The S/MTD in its name stands for Short Takeoff and Landing/Maneuver Technology Demonstrator.
This set also includes 7 skins, including the special Sorcerer Skin.

This aircraft can equip the HPAA, FAEB, or HIVAA as its special weapon.

More details on the official game page of ACE COMBAT™ 7: SKIES UNKNOWN - F-15 S/MTD Set ...