Apollo 15 was the fourth lunar landing mission.
The three Apollo 15 astronauts go through suiting up operations in the Kennedy Space Center’s (KSC) Manned Spacecraft Operations Building (MSOB) during the prelaunch countdown. They are David R. Scott (foreground), commander; Alfred M. Worden (center), command module pilot; and James B. Irwin (background), lunar module pilot. Minutes later the crew rode a special transport van over to Pad A, Launch Complex 39, where their spacecraft awaited them. With the crew was Dr. Donald (Deke) K. Slayton (wearing dark blue sport shirt), director of Flight Crew Operations, Manned Spacecraft Center (MSC), Houston. The Apollo 15 space vehicle was launched at 9:34 a.m. EDT, July 26, 1971, on a lunar landing mission.