You can be awarded a high school diploma if you left high school before graduating to serve in the U.S. Armed Forces. You can request it from the school district where you live now or the district you would have graduated from, and a diploma can be awarded after a veteran’s death.
Contact the school district where you live now, or the district you would have graduated from, and ask for a wartime veteran diploma. The Oregon School Directory lists district contacts.
Your DD214 showing an honorable discharge and the qualifying period of service or presence, and proof that you live in Oregon.