LC-14 was the first Atlas pad in operation and hosted the test flights in 1957–58. It was also the only one of the original four pads to never have a booster explode on it. By 1959, it was decided to convert the pad for the Atlas D missile and space launches, and a large service tower was added early in the year. The first Atlas flown from the renovated LC-14 was Missile 7D on May 18; however, a problem with the launcher hold-down arms damaged the missile and caused its explosion shortly after launch. This was traced to improper procedures during the renovation of the pad and was quickly fixed. The first space launch off of LC-14 was the Big Joe Mercury test in September. As the designated Mercury-Atlas facility, LC-14 was thus the only Atlas pad sporting the infrastructure needed for manned launches. The first MIDAS satellites, one Atlas-Able launch, and a few more ICBM tests were conducted from LC-14 before it was completely turned over to NASA.