(07/07/1971) - Apollo 15 Commander David R. Scott operates the battery-powered Lunar Surface Drill during a training exercise at a man-made replica of the Moon's Hadley-Apennine region at the Kennedy Space Center. During his upcoming mission, scheduled to begin no earlier than July 26, 1971, Scott will drill to a depth of about 10 feet to obtain lunar surface core samples and conduct the Heat Flow Experiment. This experiment is designed to measure the rate of heat loss from the interior of the Moon. Lunar Module Pilot James B. Irwin will accompany Scott on the surface while Astronaut Alfred M. Worden will pilot the Command Module while in lunar orbit.