Aviation Day To The Enemy CapitalOriginal vintage World War Two period poster issued by the Imperial Aeronautic Association of Japan Dai Nippon Hiko Kyokai in collaboration with the Aviation Bureau and the Information Bureau to commemorate Aviation Day Koku no hi, a national event established in 1940 and held annually on 20 September (now Sky Day Sora no Hi), featuring a dramatic high angle aerial view of a squadron of Japanese bomber planes with the red Hinomaru Land of the Rising