The collection consists of research files and publications of the Oregon Military Research Institute and the papers of veteran Richard Gaarenstroom, who created the OMRI project. The research files concern Oregon veterans of conflicts dating from the Spanish-American War onwards; Oregonians who received the Medal of Honor; military units such as the 123rd Observation Squadron; and military facilities in Oregon. OMRI's published registry lists the names and vital statistics of Oregonians who served in conflicts from the Spanish-American War onwards. Gaarenstroom's personal papers include records from his service; newsletters of the 142nd Fighter Interceptor Group; a scrapbook and photograph album from his service in Vietnam and South Korea; journals he kept from 2008 to 2023; and appointment calendars he kept from 2018 to 2023.