Thus far, only two F-15EXs have been delivered, and both saw action during the exercises.
The war game, dubbed Northern Edge '21, saw the new F-15EX integrating with the older air-superiority workhorse F-15Cs they're slated to replace, as well as the fighter's fifth-generation counterparts in the F-22 Raptor and F-35 Joint Strike Fighter.
It also accompanied F-15E, or Strike Eagles, which are versions of the famed fighter designed specifically for air-to-ground engagements. The two F-15EXs flew alongside a force of as many as 50 jets as they closed with and engaged an aggressor force of similar size and capability.