I'm a former middle distance runner. I ran in college in the early 80s. [I usually race 5K & 10k now.] I ran D2. In XC, 400 metres runners did a modified training with xc team. One 400 metres runner on occasion was good enough to race varsity xc with us. Do 400 metres runners ever run varsity xc, D1, D2 or D3 today?