You pay in-state tuition rates at North Dakota state supported colleges and universities even if you are not a North Dakota resident, based on your military service or your family connection to a North Dakota resident veteran.
Apply for residency classification through the admissions or registrar office at the North Dakota state supported school you attend, and give them your service or family documentation.
Your military orders or DD214, and for a family claim the veteran’s DD214 plus proof of your relationship and of the veteran’s North Dakota residency.