The F-15 S/MT Eagle+ is the oldest aircraft employed by the UPEO and the GRDF in the Ace Combat 3timeline, above even the F-22C Raptor II, however it remains one of the most respected aircraft in service. Derived from the earlier F-15S/MTD, technological improvements over the original model include a reinforced airframe, more powerful engines and advanced avionics including the Connection for Flight Interface (COFFIN) system.
The weight is the same as a fully loaded F-15E Strike Eagle (when it comes to max take off weight). This is presumably because the F-15 S/MT Eagle+ was used for long range/loiter time patrol missions, thus the need for a larger fuel load. Also, this airframe can take the role of an attack aircraft, thanks to its excellent loadout capabilities and the ability of the airframe to sustain more damage as compared to the F-16 Fighting Falcon series. The engines were supposedly upgraded to provide the 1382 mph advantage over the standard F-15E Strike Eagle to help in interception and long range penetration duties. A variant for an ace, the F-15 S/MT Eagle+-D, was used by Abyssal Dision.
