Japan's Lambda-4S (1966–1970)
Japan's Institute of Space and Astronautical Science developed the solid-fuel Lambda-4S rocket to launch its first satellite. The first four launch attempts between 1966 and 1969 failed. The fifth attempt in February 1970 put Japan's Ohsumi satellite into orbit.
Japan became the fourth nation to launch its own satellite.
The experience built the foundations for Japan's later orbital rocket programs, including the H-II series.
Demonstrates the multi-attempt, years-long path from small research rockets to orbital capability, with repeated failures as a normal part of development.
