Apollo 13 failed lunar landing. It has also been termed "NASA's finest hour." President Nixon awarded the Presidential Medal of Freedom to the crew and the Apollo 13 Mission Operations Team for their actions during the mission. The Cold Cathode Gauge Experiment (CCGE) which was part of the ALSEP on Apollo 13 was never flown again. It was a version of the Cold Cathode Ion Gauge (CCIG) which featured on Apollo 12, Apollo 14, and Apollo 15. The CCGE was designed as a standalone version of the CCIG. On other missions, the CCIG was connected as part of the Suprathermal Ion Detector
Apollo 15 voyage, and Apollo 15 was the first lunar landing mission on which there was a heavy emphasis on science. If Apollo 15 had flown as an H mission, it would have been with CSM-111 and LM-9. That CSM was used by the Apollo–Soyuz Test Project in 1975, but the lunar module went unused and is now on display at the Kennedy Space Center Visitor Complex. Technicians at the Kennedy Space Center had some problems with the instruments in the service's module's SIM bay. Some instruments were late in arriving, and principal investigators or representatives of NASA contractors sought additional testing