There’s no ER-2 model in the sim or any of the traffic add-ons, unfortunately.
As recently recounted in another forum, Military AI Works (MAIW) was working on porting over their P3D Military AI to MSFS and was about to release an F-15E package when Asobo changed a lot of the underlying AI tech, and all the work they’d done on the conversion broke with a sim update. They were apparently disheartened to waste all that time, and instead of restarting the effort they just decided to focus all their efforts on Prepar3D and give up on MSFS.