Oregon sets aside one day each year on which only veterans and service members on federal active duty may hunt waterfowl. You need your usual licenses and validations, and you have to carry proof of your veteran or active duty status while hunting. For more information call 503-947-6101.
There is nothing to apply for beyond your normal licenses. Check the ODFW waterfowl regulations for the designated date and hunt that day with your proof of status on you.
Proof that you are a veteran or on active duty, such as a DD214 or military ID, plus your usual Oregon hunting license, tags and validations.