My Dad served in the occupation from 45-46. We still have a Jap 25cal rifle with the chrysanthemum emblem filed off. And he had a samauri sword. After the war we were filling up landing craft with jap weapons and dumping them into Tokyo Bay. My dad said that US soldiers would go down to the craft and get what thy wanted to send home. All Jap weapons had the emblems filed off before the surrender since this was the symbol of the emperor. And no you don't want to shoot them. The 11th Airborne was the first unit to "invade" Japan since we didn't know what their response would be.