West Virginia University has a campus in Charleston that is strictly for DO's. I am not sure on the exact census, but you work out of 3 hospitals: 1 focused on trauma, 1 on cardiovascular events, and the 3rd is a Women's and Children's hospital. You'll see your general EM stuff while at each one, but the different focuses are nice. I know there is some mandatory flight time, as well. Being an MD student, however, most of my info is from the DO residents I know there.