Ki-43-IIa in New Guinea. This is apparently Tomio Hirohata's aircraft in the 59th Sentai. Hirohata is credited with 14 kills and also apparently later flew Ki-61s in the 244th sentai. He was KIA Apr. 22,1945.
Ki-43-IIa lineup. This was apparently taken at Rabaul in 1942. You can see the drop tanks are mounted on the earlier mounting points that were inboard of the gear
A group of U.S. Army soldiers, rifles in hand, wears gas masks during a training exercise in California related to chemical attacks. 1943. No photo credit available.