Kokubokan Japanese postal card, published circa 1921-22, depicting (rather inaccurately) the aircraft carrier Hosho, which was then under construction. Kokubokan (Aviation Mother Ship) is the Japanese term for Aircraft Carrier. The Japanese Kanji characters (reading from right to left) can be translated: World's newest aircraft carrier The original postcard was received from Chief of Naval Operations' office OP16-F2 in January 1943. U.S. Naval History and Heritage Command Photograph.