First of all, pay tribute to your grandfather! Tashan blocking war is a tough battle, and all Tashan heroes are real men! USN is the abbreviation of US Navy, which means US Navy. It shows that this spoon should be the material of the US Navy, and it may be the assistance of the US military to the Kuomintang army during the War of Resistance against Japanese Aggression period or at the beginning of the Liberation War.