The payload failed to operate. In the shuttle's mid-deck, a Continuous Flow Electrophoresis System and the Mono-disperse Latex Reactor flew for the second time. The crew conducted a lightning survey with hand-held cameras, and performed medical experiments on themselves for two student projects. They also operated the Remote Manipulator System with an instrument called the Induced Environment Contamination Monitor mounted on its end, designed to obtain information on gases or particles being released by the orbiter in flight. "Columbia" landed on 4 July 1982 at 9:09 am PDT, on the concrete runway 22 at Edwards Air Force Base, the first Shuttle landing on a concrete runway. President Ronald Reagan and his wife Nancy greeted the crew upon arrival. Following the landing, President Reagan gave a speech to the crowd gathered at Edwards, during which he declared the Space Shuttle operational. He was followed by remarks from Mattingly and Hartsfield and a flyover of the new shuttle "Challenger" atop the SCA, headed for KSC. The flight lasted 7 days, 1 hour, 9 minutes and 31 seconds (169.1586 hours), and covered a total distance of in 112 complete orbits. The mission achieved all objectives except for the Air Force payload, but the SRBs were lost when their main parachutes failed, causing the empty casings to impact the ocean at high velocity and sink. This and STS-51-L were the only missions where the SRBs were not recovered. "Columbia" returned to KSC on 15 July. The path of the red, white, and blue streak on the mission patch forms the numeral "4", indicating the flight's numerical designation in the Space Transportation System's mission sequence. NASA began a tradition of playing music to astronauts during the Gemini program, and first used music to wake up a flight crew during Apollo 15. Each track is specially chosen, often by the astronauts' families, and usually has a special meaning to an individual member of the crew, or is applicable to their daily activities.