78 years ago, the Ki-61-I hei took to the skies. The "hei" was a further up-gunning of the Ki-61-I, now equipped with 2x MG 151 20 mm cannons imported from Germany via submarine. The Ki-61, with 3078 total produced, often operated in the skies above the jungle. http://pbs.twimg.com/media/FB1FtSdXIAkouDw.jpg