Officer Don Thomson says the Bazooka training round found Tuesday afternoon was about 22 inches long.
The device was identified with help from explosives experts at the Oregon Army National Guard.
The Bazooka is the common name for the portable rocket anti-tank weapons widely used by the U.S. Army in Europe during World War II. Thomson says it was one of the first generation of rocket-propelled anti-tank weapons used in infantry combat.
Thomson notes that while this was a harmless training round, it's important to report anything that looks like a weapon or explosive.
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