Jim Irwin Apollo 15 Signed PhotographJim Irwin signed official Apollo 15 NASA photo James Irwin (1930 1991) was an American aviator and NASA astronaut who became the eighth man to walk on the moon during the Apollo 15 mission in July 1971. Irwin suffered a minor heart attack during the return to Earth. Apollo 15 (July 26, 1971 August 7, 1971) was the fourth manned mission to land on the Moon. The mission was notable for the first use of the Lunar Rover, enabling the crew to explore