[keltos01]

The Japanese Army developed the Ka-1 autogyro for reconnaissance, artillery-spotting, and anti-submarine uses. The Japanese Army liked the craft's short take-off span, and its low maintenance requirements. The production began in 1941 and the first autogyros were assigned to artillery units for artillery spotting. These carried two crewmen: a pilot and a spotter.

http://www.ww2incolor.com/japan/C__pia+dong+_5_4.html