The National Training Center is part of the US Army Forces Command (FORSCOM). The opposing force at the National Training Center (NTC) is the 11th Armored Cavalry Regiment, the Blackhorse Cavalry, who are stationed at the base to provide an opposing force to units on a training rotation at Fort Irwin. In September 2017, a state-of-the-art hospital was opened that provides excellent patients services to the Fort Irwin beneficiaries, according to Wikipedia.
I was there in 1993 as part of an OPFOR, short for opposing forces, intel unit. We worse berets to look like Soviet forces. We never lost. The motto: The more you sweat in training, the less you bleed in battle.