Many Oregon counties run transportation services for veterans, typically to get to medical appointments. What is offered and who runs it varies from county to county, and ODVA publishes the contacts for the counties and regions that have a service.
Contact the transportation service for your county or region, listed on the ODVA veteran transportation page, or ask your County or Tribal Veteran Service Officer.
Proof of veteran status such as a DD214, and the details of the appointment you need to get to. Individual counties may ask for more.